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Hands-on: Scosche’s New Rhythm24 Optical HR Sensor Swiss-Army Knife


I initially thought of just titling this post “Scosche’s New Rhythm24 Optical HR Band”, but in reality, that doesn’t begin to capture what they’re doing with the new Rhythm24.  Because almost everything they’ve added is about things beyond the optical HR sensor.  They’ve jammed NFC in there, onboard memory, cycling cadence, swimming support, tripled the battery, and much more.

No doubt, the original Scosche Rhythm+ has been mind-bogglingly popular because of its incredible accuracy, as well as being cross-platform with dual ANT+/Bluetooth Smart.  It’s the optical HR sensor band that you can put up against virtually anything and come away winning the accuracy war every time.  But it was also getting a bit long in the tooth.  The battery life was a downer, at only 6-10 hours depending on how old your unit was, and it lacked some of the newer functions found in other optical HR sensors – like storage.

All of which Scosche aims to change with the new Rhythm24.  Note that while this unit is being announced today (and you can also place pre-orders now), it won’t be shipping till later this spring (late April).  So keep that in mind for any purchasing decisions.

Also note, that this isn’t a review.  I’ve had a prototype/beta/something unit in my hands for about 72 hours, barely enough time for a few workouts squeezed in between the jam-packed CES schedule. Further, given it’s early beta, a bunch of pieces aren’t yet complete.  Note that as usual, when I’m done with this loaner beta unit I’ll send it back like normal and go out and get my own through normal retail channels.  You can help support the site here by hitting up some of the links at the bottom of the post.

Now before we go too far, here’s a hands-on video that summarizes it all!

With that, let’s dive into it!

What’s new:


It’s funny, these days we expect a heart rate sensor to do so much more than just be a heart rate sensor.  Sure, we want it accurate, but we also assume it’ll have other features.  Be it storage for saving a workout when a watch isn’t nearby to capture the data, or perhaps the ability to track running cadence/pace.  Maybe even to have LEDs to show you heart rate zones, or to track aspects while swimming.  All are things we’ve come to expect.

It’s somewhat ironic that despite lacking all those things originally, the previous Rhythm+ did enormously well because of the accuracy pieces.  Thus proving that in some cases, accuracy wins all.

With the Rhythm24, Scosche is going back to the same optical sensor well, and using the same provider – Valencell for the optical HR sensor.  That worked out pretty well for them last time, so no reason to change what’s not broken.  Though, it’s now a new sensor.  Valencell rightly pointed out that the previous sensor in the Rhythm+ is from 2012 (!), whereas the sensor in the Rhythm24 is now their latest gen.  They noted that “since then we’ve upgraded the MCU for lower power consumption, upgraded the LEDs in the sensor, made countless improvements to the signal processing algorithms, and made the firmware field upgradeable for future enhancements”.


Previously though that limited them to about 6-10 hours of battery life, whereas now with the Rhythm24 they’ve got 24 hours of battery life (in 1-second broadcasting/recording mode).  Scosche notes that the 24 hours is really more of a ‘minimum bar’ for them than the glass ceiling.  They’ve got more work they want to do both in terms of improvements to battery life (since they aren’t quite yet at that portion of the development phase), as well as giving users options around tweaking some of the settings for different scenarios.  Still, part of the improvement in battery life comes from Valencell and their more updated sensor.

Atop of that, there’s LED lights to now see battery status, something you didn’t previously have (aside from telling you it was dead):


The LEDs can also be used to show HR zones, which are configured through the app. At present, there’s no customization of the actual HR zones (it just uses a template), but it sounds like perhaps by shipping that’ll work out.

2018-01-09 06.39.15 2018-01-09 06.38.46

Then there’s the move to two buttons.  One larger button for powering it on, and another multi-mode button for changing sports, turning on recording, and other functions.  Unlike the previous generation Rhythm+, these thankfully don’t turn on so easily accidentally.

DSC_8339 DSC_8338

Here’s a super quick look at the button guide:


Next, the unit contains onboard memory. This allows it to store data even when a watch might not be around.  This can be useful for sports where watches aren’t often permitted (like soccer/football), or even in other cases, like swimming where someone may not want a chest strap or may find an optical HR sensor on the wrist less accurate.  But here’s the nifty trick: The unit will adhere to the ANT+ FIT file transfer standard, which means that your existing Garmin watch can actually download the data after the fact.


A little-known fact is that when Garmin’s swim-friendly watches download data from their swimming HR straps (HRM-TRI/HRM-SWIM), they actually do so over common standards.  Any vendor can support this nearly decade-old standard for transferring the HR data over.  So Scosche is doing that.  And thus, you’d be able to take something like a FR920XT, wear the Scosche Rhythm24 during a swim, and it’ll properly ask to download from that strap after the swim (assuming the planets align as planned).  At this point in the beta though, that feature isn’t yet implemented on the Rhythm24.

For these and many other pieces, Scosche is working with NPE (North Pole Engineering) on the protocol side.  They’re known in the industry as one of the deepest groups on ANT+/BLE.  They develop the NPE WASP and NPE CABLE that many companies in the sports tech industry use for their own testing.  Thus, they know many of the ‘special quirks’ that exist in the industry in making this kind of stuff look seamless to users.  I’m personally pretty excited about that.

Speaking of standards, the unit also transmits out on the following standards:

ANT+ Heart Rate: Obviously
ANT+ Running Stride & Cadence: To pair to a watch as a ‘footpod’, or to pair to Zwift
ANT+ Cycling Cadence: To pair to a bike computer as a cycling cadence sensor
Bluetooth Smart Heart Rate: Again, obviously
Bluetooth Smart Running Speed/Cadence: Same as ANT+, just Bluetooth Smart
Bluetooth Smart Cycling Cadence: Also same as ANT+, just Bluetooth Smart

In addition, the unit will transmit heart rate variability information, though, that’s primarily designed to be used at rest and not in a workout.  It’s a mode you can toggle within the app settings.  Next, during swimming, the unit changes the algorithm a bit, enabling better accuracy.  It doesn’t record things like stroke, distance, or pace.  But instead, the mode toggle is all about telling the algorithm that what you’re doing isn’t likely running.

As part of the workout storage, the mobile app will allow you to download those workouts after the fact.  It supports swimming, cycling, running, and gym modes, as well as triathlon modes.  In the triathlon mode you’ll use that smaller button to switch between the sports, and the colored LEDs will ensure that you’ve got yourself in the correct sport.

2018-01-09 06.38.17 2018-01-09 06.38.03

Next, the unit includes NFC A-Tag.  What’s A-Tag you ask? No, it’s not part of the A-Team (though, I suppose that might be debatable).  Instead, it’s targeted primarily at gyms and such to allow the unit to interact with various gym equipment pieces, like a treadmill or other machinery.  So this is different from regular NFC used for contactless payments.  Not same-same.  This isn’t really something aimed at you to use in your home, but really for larger gyms.

2018-01-09 06.37.36 2018-01-09 06.38.20

Finally, and for lack of anywhere else to plop it, the unit is IP68 waterproofed, which means that it’s waterproof for immersion up to 1 meter – which is totally fine for swimming. And the strap? Re-designed to use little snap modules that are impossible to accidentally pull off when worn (due to the locking mechanism), but easy to remove when not worn.  This also should resolve the issue of the Velcro getting caught on everything.


Last but not least, the price for the new Scosche Rhythm24 is $99, versus the $79 for the previous models.  This is a bit pricier than Wahoo’s new TICKR FIT or Polar OH-1 ($79), but simply put, it contains more features than those (see table down below).

First Run:

So let’s take this thing out for a run, shall we?  On today’s run I went all-in on new optical sensors, or just new sensors in general.  I had, of course, the Rhythm24 on me (upper left arm), then the new Wahoo TICKR FIT (lower left arm), then Polar OH-1 (upper right arm), and finally a Wahoo TICKR-X on my chest.  And from a watch standpoint I had the Garmin FR645 (right wrist), then the Suunto Spartan Trainer (left wrist).  And, sitting atop a treadmill to help record some of the HR data I also had a FR620 (connected to the TICKR FIT), another Suunto Spartan Trainer (connected to TICKR-X), Descent MK-1 (connected to Polar OH-1), and a FR935 (connected to Scosche). Holy balls!  That gives me the following HR data streams:

1) Scosche Rhythm24: Upper left arm
2) Wahoo TICKR FIT: Lower left arm
3) Polar OH-1: Upper right arm
4) Wahoo TICKR-X: Chest strap
5) Garmin FR645 Optical HR Sensor: Right wrist
6) Suunto Spartan Trainer Optical HR Sensor: Left wrist

Please note that despite how many devices I have on, I’m actually super careful to have them heavily separated to not have them interfere with each other from a HR standpoint.  That can happen if you have two watches next to each other on the same wrist.  One will restrict blood flow a bit to the next, dorking with accuracy.  The excessive number of watches are because it’s easier for me to normalize and then analyze data coming off a watch than saved files from each HR sensor.  In fact, the data from this run is actually a treadmill run, so I just set all of the ‘collecting’ watches on the treadmill.

Oh – and wait – don’t forget that the Scosche Rhythm24, as well as the Garmin FR645, are both in beta.  The Scosche more early beta, the FR645 more late beta.  As such, things may get better or worse before they start shipping.

In any case, here’s the resulting look at the run, overlaid atop each other:


Now, as with the best-laid plans, sometimes things don’t work out.  And in this case, that’s the HR data from the Wahoo TICKR-X chest strap, which was totally wonky (like drunk person wonky).  So, I excluded that.  I think my strap is dying.

From a workout structure standpoint, there was a 10-minute warm-up, a quick couple minute build, and then 3×2:30 at 6:00/mile, followed by 4x45s at 5:00/mile (the fastest the hotel treadmill would go).  In between for recovery, it was simply walking.

What you see left above is actually four data sources, though with smart recording on two of the watches it’s hard to find a data point that shows all four signals.  Either way, to be honest, the only thing that you need to know visually is that the maroon line is the FR645 optical.  The rest are virtually all identical.

The slight differences you see with the Polar OH-1 are actually *correct* on three out of the four sprints, which is a great example of ensuring you know what the data should look like.  See, at the end those are roughly 45-second sprints.  And the OH-1 is the fastest to capture my HR declining after I stop running.  We’re only talking by a couple of seconds, but I thought it was interesting.

As for the OH-1, it nailed everything here compared to the others.  Things look really really clean.  Obviously, this is only one run, but it’s actually kinda a tough one to get right with the fast changes in pace – and so far so good!

(Note: The accuracy chart was created using the DCR Analyzer tool.  It allows you to compare power meters/trainers, heart rate, cadence, speed/pace, GPS tracks, and plenty more. You can use it as well for your own gadget comparisons, more details here.)

Product Comparison:


I’ve added the Scosche Rhythm24 into the product comparison database for heart rate sensors.  This allows you (and me) to generate comparison charts like the one below.  For the purposes of this post, I’ve compared it against two other optical HR sensor bands – the Polar OH-1 and Wahoo TICKR FIT.  I’ve excluded Mio since they announced this past fall they’re getting out of the hardware game.  But you can mix and match against any HR sensors in the database here.

With that, here’s how things stack up:

Function/FeatureScosche Rhythm 24Polar OH1Wahoo TICKR FIT
Copyright DC Rainmaker - Updated July 27th, 2023 @ 10:46 am New Window
Product Announce DateJan 9th, 2018Aug 30th, 2017Jan 3rd, 2018
Product Availability DateLate April 2018Late Sept 2017Jan 3rd, 2018
Measurement TypeOpticalOptical HROptical
Typical PlacementMid/Upper ArmUpper ArmMid/Upper Arm
Battery Life24 hours+12 hours30 hours
Battery TypeUSB rechargeableUSB RechargeableUSB rechargeable
NFC CapableYesNoNo
HR TransmissionScosche Rhythm 24Polar OH1Wahoo TICKR FIT
ANT+YesYes (with firmware update)Yes
Bluetooth SmartYesYesYes
Dual concurrent ANT+/BLEYesNoYes
Analog for gym equipmentNoNoNo
Usable HR data underwaterDepends: If on same wrist, YMMV.NoDepends: If on same wrist, YMMV.
Bridging ANT+ to Bluetooth SmartNoNoNo
Can record activity in memoryYesYesNo
Additional DataScosche Rhythm 24Polar OH1Wahoo TICKR FIT
Run PaceYesNoNo
Run CadenceYEsNoNo
Run Economy/MetricsNoNoNo
Cycling CadenceYesNo
Cycling Power Meter EstimationNoNoNo
Valid HRV/RR dataAt rest onlyNoNo
Configurable Sport ModesYesNoNo
Displays HR ZonesYesNoNo
Requires Bluetooth Smart Phone for ConfigurationYesNoNo
Firmware UpdateableYesYesYes
SDK For App DevelopersNo
AppScosche Rhythm 24Polar OH1Wahoo TICKR FIT
Can show workout afterwardsNoYesN/A (No recording)
Can sync files/workout to 3rd partyYesYesN/A (No recording)
More InfoLinkLinkLink
PurchaseScosche Rhythm 24Polar OH1Wahoo TICKR FIT
Competitive CyclistLink

And don’t forget, you can mix and match any HR sensors against each other within the product comparison database here.



Overall, I think Scosche is well-positioned here with the new Rhythm24 strap.  Yes, it’s a tiny bit more expensive than the previous one, but as long as they maintain the same high degree of accuracy as the Rhythm+ has had, then I suspect they’ll continue to attract buyers, especially once you combine all the features found on the new unit.  This might be even more so the case with the ability to offload swimming HR data, sans-chest strap.  Using a chest strap for swimming is often fraught with issues (as is an optical HR sensor on your wrist).  So this could be a solution for a bunch of folks.

I’m also looking forward to seeing where they go beyond the stated specs.  With hints to areas like sleep and beyond, as well as extension of the battery life above 24 hours, they might be looking to leverage the HRV pieces in new and interesting ways not previously seen on a standalone HR sensor in the consumer realm here (most efforts are tied specifically to watches).

Still, it’s about four months away from when this will ship – so that’s still a long time for many people.  If you’re in the market for a unit now, it’s probably going to be hard to wait, especially if there’s any slippage in the schedule (I think they’re probably good on that actually).  Of course, for a company like Scosche, announcing at CES is the right move as it’ll afford them fitness media coverage they probably wouldn’t have gotten elsewhere with a standalone announcement.  Hence why they likely announced now, rather than closer.

With that – stay tuned for my full in-depth review once it starts shipping.  But since I have two beta devices, I’ll likely use them longer-term over the next few months.  Much of the sensor pieces are complete based on Valencell’s existing work, whereas the time in the schedule is mostly around app integration and the non-sensor pieces (I.e workout transfer, etc…).

Found This Post Useful? Support The Site!

Hopefully you found this review useful. At the end of the day, I’m an athlete just like you looking for the most detail possible on a new purchase – so my review is written from the standpoint of how I used the device. The reviews generally take a lot of hours to put together, so it’s a fair bit of work (and labor of love). As you probably noticed by looking below, I also take time to answer all the questions posted in the comments – and there’s quite a bit of detail in there as well.

If you're shopping for the Scosche Rhythm 24 or any other accessory items, please consider using the affiliate links below! As an Amazon Associate I earn from qualifying purchases. It doesn’t cost you anything extra, but your purchases help support this website a lot. Even more, if you shop with TPC (The Pro's Closet), you'll save $40 on purchases over $200 with coupon code DCRAIN40! The Pro's Closet has been a long-time partner of the site here - including sponsoring videos like my cargo bike race, as well as just being an awesome Colorado-based company full of good humans. Check them out with the links below and the DCRAIN40 coupon!

Here's a few other variants or sibling products that are worth considering:

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Thanks for reading! And as always, feel free to post comments or questions in the comments section below, I’ll be happy to try and answer them as quickly as possible. And lastly, if you felt this review was useful – I always appreciate feedback in the comments below. Thanks!

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  1. Chris

    want to have it and send my old Rhythm strap to sleep 😀

  2. Jim S

    Any chance the new strap would work on the old unit?

  3. Riclo

    Hi Ray,

    I have a question. I use an Apple Watch Series 3 to track my tri-weekly swims. I’ve been somewhat unhappy with the heart rate tracking from the Apple Watch (I rarely get a graph attached to my exercise summary, for whatever reason…) and I was wondering if it’s possible to use this hear rate monitor in addition to the Apple Watch: will the data be sent from the Scosches to the Apple Watch and be consolidated somehow with the Apple Watch data to show my heart rate during my swim?

    Thanks in advance if you can take the time to answer.

    • Eli

      Apple doesn’t do Ant+ so no chance of getting the data over that standard which is how garmin gets data post workout. So depends on BLE creating a standard for downloading HR data and both sides implamenting it

    • the5krunner

      @Ricolo good question.

      The new Scosche seems to nail it in very many respects. Maybe it’s a tad expensive but that’s easy enough to change.

      The ANT+ swimming/caching piece to a 935/920/F5 is brilliant (if it works)

      I think the whole area of caching is one of the keys to future markets especially when transmitting over BLE to apps or Polar or, as the questionner suggests, to an Apple watch. Even some nifty post-workout way to combine the Apple data somewhere, somehow might win scosche new customers. Mayeb it’s jsut the case of an Apple Watch HR caching app from Scosche

      Loot at STRYD on the Apple Watch. Maybe the units are not shipping in the millions yet but the market is there for devices like STRYD/Scosche.

      I’m not just talking caching whilst swimming: I’m talking team sports, gym classes…BIG markets where not everyone can or should wear a watch. That was where Polar stole a lead with the OH1

    • Riclo – I have not used an external Bluetooth HRM with my Apple Watch Series 3 for a swim workout, so I can’t answer your main question. I can tell you that I get good swim HR data from my Apple Watch. I record my swims with the default Workouts app on the watch. Afterward I export the FIT file with an iPhone app called HealthFit. That app sends the file to SportTracks.mobi, where I can clearly see heart rate, stroke rate, stroke length, SWOLF, and more from the workout on a chart.

    • Riclo

      Thanks Sam. I actually do something fairly similar: I also use the default workout app, export the FIT file with HealthFit, then use the Garmin platform (just because I used to use a Garmin Swim before getting the Apple Watch, but I’m not partial to Garmin and could use any other platform). I have however noticed gaps in my heart rate recordings from the Apple Watch, and that’s why I was considering using an external source for the HR data.

    • I agree with the team sport market being big. Many of us do functional training where you can wear your watch (Fenix 3HR) in my case but you can’t use it during training on court (basketball in my case). This is a shame and I have been looking all over the web for possible solutions (footpods, straps, wearables). The only somehow manageable solution was Whoop, which does not ship outside the US. Footpods with internal memory are hard to come by and do not support all possible standards. Only found the Milestone pod with onboard memory but I wasn’t sure how well it would sync with GC and also activity is automatically detected which is somehow weird for team sports with lots of bursts.
      So the 24 looks really like a viable option since the location is ok and you can cover it in order to avoid exposed plastics. DCM could you cover possible team sports applicability with such generic wearables maybe?

    • DT_2015

      I wear my Vivoactive 3 under a sports wrist sweat band while playing basketball. No problems at all while playing no risk of injuries either the sweat band is thick enough to offer the extra protection needed.

    • Thomas Tollstedt

      Is the HR caching working for you? Mine is not and support said it is coming in July this year. I bought Mine thinking it was enabled after 1 year since release ;-(

  4. Mike St Louis

    Hi Ray,

    I use my Apple Watch for swimming. Could I use this new Scosche unit for the HR data? I’m not sure how well AW plays with external HRM.

    Have you tried it in the pool yet? I’m wondering if it will stay in place on the forearm.

  5. Casey

    Does it record swimming stroke data? I’m intrigued by the swimming data

  6. Matthew Weigel

    How does “cycling cadence” work? I know the TICKR-X supposedly tracked cadence on indoor bikes, but I can believe that working a lot better on your chest than on your arm. Especially if you get in the aerobars ever…

    • Zoltan

      You have to put it on your ankle.

    • You do not have to wear it on your ankle. The Rhythm24 provides excellent cycling cadence while the device is on the forearm. It uses internal accelerometers to detect body sway from left to right while pedaling. We have test this on bikes such as the Keiser M3i and have seen good results.

    • Zoltan

      I guess you tested it not just on stationary bikes, but also on some moving on the road.

      What about recumbent bikes when one’s body is lying, quasi in an attached way to the seat? Did you make any tests with them?

    • Bruce Cooper

      Zoltan, if you get the answer about recumbents, I would be interested as well.

  7. Eli

    Is it meant just for sport use or is it meant to be worn when less active? Valencell at least in the 2.0 version of their sensor has three modes Standard-Precision RRi, fast RRi sampling rate, and fastest RRi sampling rate so seems like battery life could be extended by detecting if not active so drop down a level in how it detects HR.

    • the5krunner

      Ray, as a follow up to @Eli ‘s points on the Valencell unit.

      I’m reasonably sure that the Suunto 3 has HRV over the optical HRM at night to support the new Firstbeat apps. I would assume the Suunto3 has the same OHR unit as this Scosche. So more detail on the HRV@sleep side would be super cool at some point. as you know there’s not really any practical nightly way to measure HRV apart from products like EMFIT…so this could be great for Scosche

    • Eli

      With the Scorche just coming out it could be a newer version then the 2.0 revision of valencell hardware that came out last spring (velencell’s web site has details on their hw) with Suunto using the older version

      Would still rather have a HRV traker that doesn’t require any work to get all the info. Thinking the details hrv4training gives. Though that is made harder by how supine position may not be the best link to myithlete.com

    • the5krunner

      watch that space

    • Yeah, I spent some time with Valencell today getting clarity on that and exact which sensor packages each product is using (Suunto and Scosche), and what features they’re capable of.

      The two-line version is that actually every product we’re talking about here is capable of HRV in a non-workout setting (rest + day to day usage) from a Valencell standpoint. It’s just a software feature that companies can choose to leverage. There’s no dependency on the 2.0 package, which nobody is using yet since the reference designs won’t be available till later this quarter, and then not available to ship till Q2.

      The vast majority of the 2.0 package features are focused on battery life for ‘lifestyle’ applications (meaning: 24×7 HR for multiple days at usable intervals).

    • The Rhythm24 has a heart rate only mode that has less demand on the battery. HRV turns the frequency on the sensor way up so has the most demand on the battery, but only for short periods of time under normal use. The sport modes all fall between those two extremes.

  8. Mirko Surf&Run

    No 🙁 I just bought the old model in clever training europe… I suspected that a new was arriving because the Scosche was’t available anymore in amazon.it

  9. Rich

    Hopefully they’ll make a better job of the firmware than the current version for the Rhythm+.

    I’m looking to replace my Rhythm+ because I’m fed up of manually removing the erratic readings it produces (I’ve not got a max HR of 32,000+, honest), and at the moment the Tickr Fit is probably the safer option rather than risking another erratic Scosche.

    • From Scosche: For the Rhythm+ we have identified some issues in the 3.01 firmware when using Bluetooth and are working on a fix. We are also working hard to release a new app in the next couple months and the new firmware will release with the new app, while we phase out the current app. These issues have already been addressed with the Rhythm24.

    • Mirko Surf&Run

      @Steve: my Rhythm+ is circa one year old and it should have 2.6 firmware. I find heart rate accuracy quite good. I use it just with my Garmin FR610 with Ant+. Do you think that I would have an advantage with the 3.01 firmware for accuracy or it’s better to remain with 2.6 firmware?

    • The Rhythm+ has always been very accurate. The 3.01 fw wasn’t intended to address accuracy so you won’t see any improvement there.

    • MirkoSurf&Run

      Maybe I will update to have also running cadence. I think I will wait the new Android app. Thank you

    • Sam

      I stopped using my rhythm+ due to the same issue as the post above. After I installed the 3.01 fw I started getting at least one reading per run of either ~8,900 or >32,000. I lost the data for several runs because the app I was using wouldn’t update to the website due to the errant reading. I upgraded the fw because I was having trouble pairing to my phone after iOS11 came out, but it didn’t fix that either. I still have to restart my phone every time before it will pair. Probably best to make sure these issues are worked out before buying the new one. And it’s great that Scosche is working on a fw fix, but this problem has been out there for at least 3 months and probably longer so it’s disappointing that they are still working on the fix. Most of us would be happy to just go back to the previous fw.

    • Steven Power

      Hi – I just bought the new Rhythm 24 (today 13th July) … I updated the software via the app. I then connected it to my Apple Watch (software 4.3 (15T212)) … connects fine, gives a heart rate reading in the Heart Rate and Workout apps but after 5 – 7 minutes it just disconnects. And it keeps happening, each time I’d reconnect it and the same thing would happen.

      Any idea why this might be? Sounds like it’s a known issue?
      Would be great any help you could offer.

  10. A

    Was it designed by the 90s design team ? the look and size are not attractive .

    • Dan G

      I was thinking the same thing, but I rather like it. I like tech which is chunky and functional, rather than trinket-like.

    • A

      Yes but time has changed, tech alone is not going to survive today competitive market.

      In addition, the battery life is not that great and LED won’t help to improve the battery life.

  11. Jeff

    I would love this this if it could supplement my Fenix3 to provide passive (non activity) HR data. Too bad

    • Zoltan

      Why? I thought any HR chest strap can replace the mediocre wrist HR scanner of F3HR to get a full day HR graph.

      I have two straps and if both of them are set as active there are pop-ups to choose from them, even if I have not started any activity app.

  12. Dr_LHA

    Looks like a solid piece of kit, but boy, do their product designers need to step up their game. This looks like a piece of cheesy electronics from the 90s, what with the shiny “swish” window onto the LEDs. The purple strap doesn’t help things either.

    Interesting that it does cycling cadence. Any feelings as to how accurate it is?

    • Ben

      I was thinking the exact same thing! It looks so retro and cheap. The Wahoo looks much nicer and I even think the older model looks nicer.

      Having said that, for sweaty sessions in the basement, functionality will trump looks. If Ray confirms that it is still the best option, then I’ll go for it.

      I think lots of people will choose the Wahoo based on the brand/looks though.

    • I’ll be honest, i don’t get the dislike of the strap design.

      I wonder if it’s simply because of the purple color variant I happened to photograph? Maybe I’ll unbox the black one and take some pics.

    • gingerneil

      I’m with you. It’ll be hidden under a shirt sleeve most of the time anyway!

    • David

      I would do that, the black unit shots on Clever Training (ordered from your link!) are much better. The actual unit is a bit bigger than the Polar and Wahoo still and the LEDs are a bit ugly but all in all this is obviously the one to beat IMHO now between best in class accuracy, 1 day battery life, and all the new features.

  13. Stephen

    I wish this was out about two months ago. I would have waited for it at $99 compared to the Garmin straps with swim capabilities (both $200). This is pretty nice!

  14. Patrick

    I’m curious about that accelerometer they are using for cadence. It’s gotta be a nice multi-axis and algorithms would be the only limited factor. It’s going back a few years, but that upper arm was found to be a pretty good spot on the body for measuring physical activity. It seems like a next logical step would be using something like this for ‘running power’ since there’s a good chance consumers are going to want it, even if it’s definitely in its infancy at the moment. Sensewear was a pretty big name in physical activity research ~10 years ago and was using similar tech and algorithms. Maybe it’s not too far of a leap.

  15. Steven Knapp

    How will this know my cycling cadence? From my arm movement?

    • The Rhythm24 provides excellent cycling cadence while the device is on the forearm. It uses internal accelerometers to detect body sway from left to right while pedaling. We have test this on bikes such as the Keiser M3i and have seen good results.

    • Mirko Surf&Run

      Will in the future the old Rhythm+ support cycling cadence with a newer firmware?

    • There’s no current plan for that.

    • MirkoSurf&Run


    • Bruce Cooper

      Steve, will this give me cadence while I an on my Recumbent trike? I would think not. We do not move our upper bodies near like on a bicycle.

    • Fred B

      Hello Bruce,

      It would be great to hear how well it works for you – the Rhythm24 should pick up your cadence.

      Here is what I tell everyone about our Rhythm24 cadence – it does a great job of capturing your average cadence on a road bike, indoor trainer, or running, but if you are looking to train to a specific cadence while on the bike, i.e…needing to be at 110rpms for 30 seconds and back down to 90 for 2 minutes — you should have a cadence sensor on your crank arm.

      Let us know how it goes with your Recumbent trike.


  16. Patrick

    and what’s with everybody giving you pink and purple bands lately?

  17. Matt

    Looks like a nice piece from a features standpoint. Design leaves a lot to be desired.

    But even with the reduced feature set, I’ll probably be changing to the Wahoo TICKR fit. Scosche burned me on their customer service, so I just can’t justify supporting them again.

  18. Vince

    Looks like a nice replacement for my existing Rhythm. Now if only Garmin would update the Swim to the modern era. I’m afraid to use to my 735xt in the pool. Need to push buttons underwater.

  19. Brian

    Another vote for an explanation of how it does cycling cadence. 🙂

    I’m assuming you don’t strap this to your ankle/calf?

    • Yeah, once I get back (to my bike), I’ll test it out. Maybe I’ll give it a whirl in the morning on a gym bike if there’s one downstairs.

      I don’t know if they’ve implemented the code for it yet. But from talking to others in the industry, it’s pretty easy to pull out cycling cadence due to the movement.

    • Brian

      Thanks, this would make for a nice little device for spin classes and the like if it pulled HR as well as cadence.

    • You do not have to wear it on your ankle. The Rhythm24 provides excellent cycling cadence while the device is on the forearm. It uses internal accelerometers to detect body sway from left to right while pedaling. We have test this on bikes such as the Keiser M3i and have seen good results.

  20. mjl

    Pure speculation: the unit would be strapped around the lower leg to measure cycling cadence, not around the arm.

  21. gingerneil

    My OH1 screwed up again today, but the tickr fit still isn’t shipping from Amazon…
    The new scosche looks really interesting and I’d prefer it over the tickr. Don’t know what to do now… Wait until April with the OH1 screwing up or swap for the tickr and see how that goes now. I’ve got a 10 hour event planned for end of Feb, so will need something for that.
    Competition is great… But it’s hard work!

    Another question… How does the heart rate fit download work? Do you need to have an activity running concurrently on the watch, or will the watch detect the HR fit file on the scosche the next time it connects and then create a new activity when it downloads? Or will it do both?

  22. Steve Catlin

    Will this device remove the need for either my Garmin foot pod or running pod I.e will I get garmin running metrics from this?

    • Correct on the footpod. You won’t get any Running Dynamics metrics though.

    • Andreas Loeffler

      would the hardware allow for Running Dynamics similar to what the garmin HRM straps can do (like ground contact balance) … so something a future fw update could fix?
      would that work at all if worn on the arm instead of the center of body?

  23. Thomas Goebel

    Will this watch capture any metrics other than HR during HIIT classes such as Crossfit?

  24. Wantfit

    Hi, Ray, will this new Scosche compatible with old Fenix 3? I have rhythm+. Love it.

  25. Jeff Noon

    Can the app download workouts after the fact over bluetooth? I currently track volleyball on my Rhythm+ and keep my phone close enough to the court to record the data, it would be nice to not have to worry about the range?

  26. Mark

    Ray, have you had a chance for a Rhythm+ vs 24 direct comparison yet? I’ve had 2 great years with a +.

    2: if it exports FIT files, can’t you combine them and upload to the strava of your choice if you don’t have a multisport watch? Or are/is the recorded swimming HR data locked away?

    • 1) Not yet, mostly because I was trying to do 24 vs TICKRFIT and OH1 comparisons. Once I wrap up at CES I’ll likely do some more comparisons of the optical sensors.

      2) My understanding is it does export .FIT (it’s not yet working in my beta app), but there honestly isn’t a good way to combine .FIT files that I’m aware of. :-/

    • In our testing with the FIT Files, we have been able to combine HR Data with Cycling and other FIT Sport Modes.

      This was tested by posting to Strava and Training Peaks, in which they were able to intemperate the different activities. So in a Tri or Duathlon mode.. it will show your correct activities in the FIT file.

    • the5krunner

      do you mean combine more than one file of the same workout to create one workout in some piece of software OR combne two fit files for the same single workout to make one fit file where data types are merged eg merging swim hr from scosche with stroke data from a garmin

      1. the former is easily done in sporttracks, probably other software too. you can then export it as one combined workout file (tcx poss fit too). However special stuff might be lost like swim strokes
      2. combining fit files for the same workout may well be possible as one offs with “fit file repair tool” …

      i think steve (presumably from Scosche) means that he can bolt a run fit file on the end of a bike one to create a multisport workout…that is an easier scenario i would imagine.

    • Mark

      #2 is what I was thinking. I’d hope something like fit file tools would work. Maybe I can convince my wife to try it this summer

  27. Wendy

    I’m one of those unlucky athletes who has not had great luck with the Scosche through the years :/ , even discounting the 5-10mins it needs to recognize my hr and not my running cadence. I rarely get a correct heartrate when I’m running downhill (yes I’ve tried both tightening down on it A LOT and leaving it just tight enough to stay in place) , so it’s pretty useless to wear it anywhere but flat workouts/races. Which are actually few and far between in my hilly town. I have correct hr readings for an hour of hiking-running uphill and then suddenly my hr is 180-200 for the downhill, which obviously messes up avg/ max hr #’s that would otherwise be interesting.

    So my question is, with the problems I’ve had for years using the original Scosche Rhythm, is it likely that I’d have similar problems with their new version and should switch over to Wahoo? Will Wahoo customer service at least be more responsive/helpful than Scosche if I find that the product is really just not accurate for you?

    • Alex

      I’ve also had a very uneven experience with the Rhythm Plus. No matter how much I tighten it or where I wear it, it mistakes my cadence for my heart rate for about the first eight miles of most runs. So I use my trusty Garmin HRM strap, as annoying as it is to put on, for my running and have relegated the Rhythm Plus to measuring my heart rate when I’m riding the bike. I’d be reluctant to take a chance on this new device.

    • Just to clarify on this: “even discounting the 5-10mins it needs to recognize my hr and not my running cadence.”

      Are you starting running before it has HR lock?

    • Wendy

      I’ve been wearing the hrm with my watch turned on for 20+mins driving to a run etc., so I figure that’s as locked as it’s going to get on my hr. It’ll look correct when I’m standing still about to start the run, but usually by the end of minute 1 chill pace, my hr has jumped over 150. I used to stop and then wait a few mins to see the right hr again, only to see it jump back up as soon as I start running. After a few months of that I fully gave up on caring about the first 10mins of the run.
      Perfect example is this run I did last week, 4 miles uphill where my hr steadily rose to the top of the climb (except for the garbage first 5mins), and then 5 mins in to running downhill and it says my hr is 180’s (I’d have to be almost-dieing finishing a 5k race to have 180’s hr). link to strava.com

    • Matt

      I’m in your boat. Bad luck with the Rhythm+ and Scosche. I’m tempted by this b/c of the features, but likely will go Wahoo once it’s available on Amazon.

    • Brian

      I’ve been having issues with a newer Scosche in the same way. I tend to turn it on while driving to my run location so it definitely has a lock, but it still tends to grab a cadence annoyingly too often while running and even moreso while cycling.

      The irony is my original Scosche (the model before the implemented the hold-press to turn on) still works great and has none of these issues. So I use that one as much as possible and the newer one as a backup.

    • Alex

      As Wendy and Brian mentioned, I also will wear it on my way to a run, giving it plenty of time to lock in. I’ll even walk for a bit on my way to a run start, giving my skin time to warm up. On some rare occasions, it will actually work OK. But in the vast majority of cases, it picks up my cadence. It’s one of the reasons I’ve been reluctant to give up my Forerunner 230 (which lacks built-in optical HRM) for one of the new Garmin watches out of concern that all my runs will start out looking like I should be in the emergency room. :O At least with bike riding it’s not a concern. I don’t usually wave my arm around when biking. 😀

    • Wendy

      In the irony of timing, my roomba just ate the power cord for my Scosche 😀 lol! So I placed an order on the Wahoo website for their new optical option (Clever Training said that the product can’t use that 10% discount code :/ oh well) since I didn’t like the unknown wait time on Amazon.

      But it’s at least a lil reassuring to see that it’s not still just me having problems with the Scosche ! At this point I’d happily accept a few lil inaccuracies in an interval, compared to the 180’s+ readings for 30-40mins of downhill running. I’m really curious what my hr is on fast vs slow downhills, maybe someday I’ll find an optical hrm to tell me hah!

    • Andrew

      I had endless problems trying to get mine to charge. Most of the time when I set it on the charger, it would keep running instead of going into the charge mode. I’d have to turn it off, put it on the charger, take it off, put it on, turn it off, put it on, turn it, put it on for sometimes minutes until it would give the correct blink sequence indicating that it was charging correctly. If I didn’t fiddle like this and just put it on the charger, it would be dead/drained after the intended charge/overnight. This got old quickly, so I haven’t used it in years. A total waste of money.

  28. Darren

    Ray, what’s up with the 645 HR curve in the comparison above?

    Doesn’t bode well for those of us who are interested in upgrading there unfortunately.

    • No idea, it’s the worst data set I have from 4 weeks of running with it. Which is ironic, because it was a simple treadmill run. Go figure.

      I’ll be shooting it over to Garmin and they can dig into it. When something goes amiss, with the files they can tell me the exact moment it lost tracking and why.

  29. Andrew

    Can I use this as a TRI HR strap (and not have to go through the mode buttons?

    • Yes. I can’t validate how it works yet, but that’s the plan.

    • Andrew, there is a Triathlon mode in the app. Once set, the Rhythm24 will start in swimming mode and when transitioning, all you need to do is double tap a button on the device and it will switch to the next mode… biking then running. You can record your entire race and upload the data to your mobile device after, and you will see all three of your stages with the corresponding data that comes with each of those sport modes.

  30. It would be nice if there was a feature to mute LEDs from the app.

    Maybe you could nudge them about this.

  31. Mark

    “The unit will adhere to the ANT+ FIT file transfer standard, which means that your existing Garmin watch can actually download the data after the fact.”

    Yeesssssss. Finally. Im totally buying this if it works with Fenix 5X. No more HRM-Swim with tape to keep it from sliding down to my ass dork factor 😎

  32. Eugene

    my that thing is ugly.
    its a good incentive to wear it as high up as possible so it can be hidden by a shirt sleeve.

  33. John

    Hooray, another cadence sensor!

    (Yes, I’m still bitter about wasting my money on the last Scosche HRM. Utterly useless.)

  34. Can‘t help, but I find the „design“ so horrible. Looks like something out of a chewing gum machine from the 70-90‘s – but in 2018. ? It would be worth if they would put in some effort to make it appealing – good WAF is never wrong. ?

  35. Eugene C

    Any noteworthy weight differences between the OH-1, TICKR Fit and Rhythm 24?

  36. Mark

    Bluetooth 5?

    Because that’s the one which supports connectionless broadcasting like ANT+, albeit less bytes.

  37. Richie KM

    I’m trying to interpret your workouts according to your description and I’m totally confused – 4×2:30 at 6:00/mile, followed by 5x45s is not what I see 🙂

  38. How’s the change of the band going to affect smell? One of the things I really find annoying is that despite washing it regularly I don’t get my chest strap free of all smells anymore. Other than that, I’d appreciate a budget option that indeed only offers heart rate with long battery life. And, yes, something that is going to be seen by people (unlike a chest strap), should have some visual appeal of 2018.

  39. Giles Roadnight

    Very interesting!

    I love my existing Scosche but this has some interesting new features.

    2 yes no question though please Ray that seemed a bit ambiguous in the text:

    1) can I use it for collecting and storing HR data whilst swimming (table says depends)
    2) can I wear it for a “normal” (no exercise 24 hour period to capture HR whilst resting / working / sleeping ect.

    Think I’ll be ordering one of these regardless but I am interesting in this functionality.


  40. Grant

    How cool is this! love my Scosche, is there an option to pre-oder on Clever Training UK?

  41. codyish

    I can’t wait until somebody comes up with a soft, comfortable, long lasting HR strap that goes around your chest so it can measure directly at your heart. That would be really accurate and unintrusive.

  42. Nathan B

    Hi Ray,

    Any idea if the new app is gong to be compatible with the older strap?

    Since the 3.0.1 update, my Rhythm+ has been dropping connections and locking up a lot.

    The existing app appears to have lost the ability to update the firmware for the device.

  43. Martin

    Would this strap be compatible with Garmin vo2 max and lactate data. Not bothered about the vertical or stride ratio stuff. Thanks

  44. Nathan B

    Is the after the fact recording of HR during swimming only compatible with Garmin’s premium watches, or can I use I with a VA3?

  45. David

    Ray: I think you may have answered this before but assuming you weren’t testing equipment (yeah right) would you *ever* choose a chest strap anymore or do you feel we have reached the point where between optical on the wrist for most running and optical on the arm for interval running and all other supports (but perhaps swimming?) we are more than “good enough”?


  46. Joop

    H’m, I guess that the “Steve”, who commented a few times in this thread, is an employee of Scosche. This is new for me: Scosche communicating with customers about a heartrate monitor. I didn’t get any reply from them when malfunctioning was an issue with my Rythm plus and I wasn’t the only one….

    • Mirko Surf&Run

      When DC Rainmaker made his first review, Josh of Scosche was very active in the forum and very helpful.
      I never needed to contact Scosche, so I can say anything about the support of Scosche. But if you read the forum of the first review of the Rhythm+ , all users were astonished how fast was Scosche to respond and find a solution.

    • Joop, my apologies if you didn’t have a positive experience with Scosche customer service when you tried contacting them. I work in product development and we have been working more closely with our customer service team to address concerns with Rhythm+. If you would like to try again, please contact us and we will try and help you.

    • Patrick Utrecht

      Well Steve, one of the biggest sportswear retailers in my country used to sell the Rhythm+, when I wanted to buy another one they had already stopped. The reason they gave me after I inquired why they stopped was that the communication with you guys was bad. Their words, not mine. I do notice that it’s hard to get your hands on a physical copy in an actual store here (the Netherlands) but there are a handful of smaller internet shops that sell.

      As for myself, I send inquiries twice to your company about where to get another item or when / if the then new colored straps would ever be available in Europe, but got no response. It’s not technical help that I needed, but it would’ve been nice to have gotten at least a reply. On to the good news: I’m looking forward to the new rhythm 24 because it’s ticking a lot of my boxes I was looking for in an upgrade. Better battery life was the most important one.

    • jm1

      to Patrick Utrecht

      try alzashop.com (the first/second biggest e-shop in the Czech Republic),

      link to alzashop.com

  47. Richard

    Where is the iOS app? I’ve been looking all over for it.

  48. Andrew

    Will replacement straps be available on day 1 of release?

  49. M3V8

    During winters, the nice part of Rhythm+ was that you could wear it on your upper arm underneath your long sleeve jersey (cycling) as you kit up. At the race, you could press through your jersey to turn it on – basically just mash your finger on the center of the Rhythm+ and wait for it to appear on your Garmin Edge. With two buttons on the Rhythm 24, it’s not going to be as easy. But with the longer battery life, you could actually just turn it on when you kit up and drive to the race. I know you can never satisfy every customer, but I find Tickr’s one button solution to be a better match for my narrow needs.

  50. Aran

    Forgive my ignorance, but does this device not have a readout display? Must it connect to an app or a watch to do that?

    • Bobbykins

      No it doesn’t. but neither does any other manufactures as far as i know. Scosche’s led’s however would indicate what zone you are in at any given time.

  51. Brian

    Steve – As I mentioned earlier in this thread, I have two of the original Scosche units, the first I bought almost immediately after Ray posted his original thread, and another newer model that has the different button configuration (hold to turn on).

    The newer model has been increasingly frustrating lately…grabbing onto cadence, dropping out signal, etc…while the original still works great. I’m guessing the new one needs a FW update, can I do that using the old “scosche fitness utility” app? I mostly just use that app to check battery life but it obviously does more than that, but the interface is fairly primitive.

    Appreciate any feedback as I love the scosche HRM and have gotten several of my endurance friends onto the product.

    • Bobbykins

      Brian. I too have a similar Scosche units, One i only have to breath on to activate it and a later unit with firmware 2.4. Upto version 2.4 they have to go back to the USofA to be updated. So far I’ve resisted sending them back. Would i be charged import duty into the UK a second time when they came back? too many unanswered questions for me.

    • I think there are different 2.4 revisions too. Mine is 2.4 but it can be turned on by glaring at it, but needs holding down the button to turn off. I hate the button but I don’t want to send it back to the US and risk import charge either. Can’t wait to get the Rhythm 24.

    • For the Rhythm+ we have identified some issues in the 3.01 firmware when using Bluetooth and are working on a fix. We are also working hard to release a new app in the next couple months and the new firmware will release with the new app, while we phase out the current app. These issues have already been addressed with the Rhythm24.

    • Giles E

      Steve, will there finally be an Android app?

    • Matt


      What can you guys actually do for your customers? I’ve got 3.01 but don’t use it on bluetooth and still a ton of issues. I’ve stopped using it because it’s just too frustration and Scosche customer service was in no way helpful in my experience and multiple emails?

      What’s the purpose of me emailing again just to be told “we’re working on a fix”? That’s great, but it’s now 4+ months with a faulty Rhythm Plus.

    • Matt, please email me directly at rhythm@scosche.com and I will try and help you.

      Steve (Scosche)

    • Yes, the new Scosche Sync app for Android will be released in May. Stay tuned and thank you for your patience.

    • Kelly

      Any updates on this? I just received mine and am sad that I can’t really utilize it’s functionality without an app. Is there a way to download the recorded files without the app? I’m an android user and hoping to get an app that will work with this soon.

    • MikeDozer

      When the app for android will be realsed? Got my Rythm24 already (in UE 🙂 ) and cant configure a thing 🙁

      Best regards!

    • For me it’s the same (in Germany). Can’t setup the thing without the app. Where is it? May is in the past.

  52. Johan P.

    I have been looking at getting an optical HR sensor that’s worn on the arm for some time (I think it’s much easier to wear than a chest strap). The Cycling cadence is very intriguing. I will keep an eye on this device’s more in depth review. Just hope I can find it from a retailer in South Africa.

  53. ReHMn

    Talking about accuracy at Scosche Rythm+ or any optical HRM, there will be always issues.
    Based on my experience, there are gaps in recording during summer temperatures, because the unit’s LEDs are sliding on a sweating skin. In the winter there are bigger gaps, because the cold and dry skin is not a proper medium for the emitted light to penetrate…
    Despite this, is like it with the 910XT combo. For the 920XT i got the HRM Tri and HRM Swim, so no plans to purchase a new one, just a jealousy on that 24h capacity…

    • That bottom chart looks like some sort of battery/connectivity issue, not typical HR drops. HR accuracy drops on a Garmin device don’t show up as null, they show up as an inaccurate value. Whereas connectivity/battery drops show up as what you see for ‘winter’.

    • Jeff N

      I use my Rythm+ to track volleyball and sweat profusely with no gaps recording to the Wahoo Fitness app on my phone. I do wear mine fairly tight on my arm though so it doesn’t move.

  54. Joel

    The product page say it will be ip67. Usually, thats not good enough for long swims. Its that the final water protection rating? I’m worried about using the hrm for a swim longer than 30 mins.

  55. Azrine

    What app are you using to sync the new rhythm? I tried looking on the iOS App Store but couldn’t find it.


  56. Dushko Kantardjiev

    To investigate the real merit of the device (accuracy, stability, precision), a true HRV sensing application (ex. HRV Expert by cardiomood.com) excellently fits the purpose. Would be surprised how much noise (ectopic beats) even the “reference” grade monitors (Viiiiva, TickrX, H7) produce while in action.
    I would be really interested to see how TickrFit ranks in that regard.

  57. Brage

    Can this be used for tracking the pace for Zwift Running? And how is the accuracy conpated to footpods?

  58. Andrew Clarke

    I’m surprised it’s taken this long to get a product like this. I’d think pairing a basic smartwatch to a feature-packed sensor array somewhere else on the body would work well.

    The watch could forego things like optical sensors, and focus on being a great display with good battery life.

    The sensor array could be slightly more bulky as it’s out of the way, and could pack in a lot more sensors that work better farther up the arm (or wherever) anyway. Sure, it’s two things to charge, but you get better battery life, and more sensors.

  59. Jan

    Hi, I have a question regarding the cached data. Will Heart Rate, Running Stride & Cadence be synced afterwards to a Fenix 5 if I start indoor run while connected and then leave the watch in my bag while playing soccer? Or will it be just Heart Rate as it would be with the HRM Tri?

  60. Rónán

    Given cadence and Bluetooth, would this work as a running sensor for Zwift?

  61. Eli

    Going to cover any of the other new hr measurement tools from CES like underwear that tracks heart rate?
    link to shop.skiin.com

  62. Brian

    I don’t suppose they are going to surprise us by announcing this device will also store and playback music? What a fantastic product that would be.

  63. Ivor Ligertwood

    Hi there, I’ve been using the original Scotché for HR and HRV. Elite HRV, the app I use recently said that the Scotsche is not suitable for accurate readings as it smooths out the data.
    Can you recommend a optical HR watch that is also good for HRV?

    Thanks for all your hard work,


    • Unfortunately, when it comes to optical HR data during a workout – no device on the market today is capable of it. Only for HRV data at rest (the other 23 hours of your data).

      Keep in mind the Scosche 24 is using different sensor tech than the Scosche you currently have, hence why it has a dedicated HRV mode.

  64. MirkoSurf&Run

    The new band without velcro will fit also the old Scosche sensor?

    • MirkoSurf&Run

      Excuse me Ray, but I watched your video and it seems that the new band with two hooks at both ends should fit also the old Scosche Rhythm+ sensor. If not, could you suggest Scosche to modify the new band in order to be compatible with the old Scosche Rhythm+? It would be nice if also the old customers of Scosche could benefit of the new and improved band. The velcro of my old band is now a bit deteriorated and the band comes easy out of place, especially when I wear clothes, and I need to buy a new replacement band.
      In the picture attached you showed in your video the new hook system of the Scosche 24. It seems compatible to me also to the old sensor.

    • While the bands are the same width, the plastic ‘hook’ on the band connects to the metal pole that goes across. That metal pole is thinner on the 24 than the plastic ‘pole’ on the +, thus, it won’t hook onto the unit.

      Also, on the 24, the metal pole is perfectly round, whereas on the + it’s squareish. So on the 24 the strap attaches in one position and then rotates around the pole to form a lock (you can see that in the video a bit at one point). Whereas on the +, it’d be impossible to make that rotation due to the square angles of the pole.

    • Mirko Surf&Run

      What a pity! I like everything of the scosche Rhithm+ except the fact that in the same way of the Chest strap you have to change the band every year.

  65. Will it record resting heart rates under 41bpm? I recently bought the Rhythm + and am utterly disappointed that it won’t record my resting heart rate which is typically in the low 30s. See image – the recorded rate just flat lines around 41/42 and won’t record lower.
    Please let me know, as I’d like to find a monitor that can record a full range of rates!

    • chris

      you beat me on the lowest hr, the lowest mine got to was 42!
      I know it culls readings below this range as “errors” as part of its algorithms, but with the modes surely now they could put it into a “sleeping” mode for a lower range of values.

    • Unfortunately it does not detect heart rates under 41bpm. Due to the way the sensor detect blood flow in the tissue, it becomes very difficult to sense heart rate under 41, so to prevent reporting inaccurate data, it simply zeros out.

      Steve (Scosche)

    • bike bill

      Very interesting that HR less than 42 does not indicate! I seem to indeed notice this. Then, could someone (Steve !) comment on whether there is a MAXIMUM HR the Rhythm 24 will indicate. I have some, indirect, evidence that this might be 220, but would like to know for sure if there is some technical upper limit for the device.

    • Fred B.

      Hi Bill,

      You are correct, there is a set range: 40 to 220. We are looking into the steps to broaden that range – I’m thinking 32 to 227 for people that have a simal range to a thoroughbred horse. ;o)


    • bike bill

      Thanks Fred….. hard to come by these details! I might have thought such range limitations would have to do with limitations of the sensing method (PPG: sensing thru the skin). Are you implying that its only a digital limitation set in the electronics?

    • Fred B.


      It’s a combination, but pretty much a limitation of the sensing hardware and thus the PPG.



  66. Brian

    As I said above, I have the “original” Scosche HRM (the one the above poster said will turn on if you just glare at it – funny) and I have the “v2” which requires the long-press to turn-on.

    Again, lately the “v2” is just downright maddening to use. My original had a dead battery so I typically do, I used the v2 as my backup. On a treadmill workout, it just flat REFUSED to capture my correct BPM…

    …unless I held my arm above my head. Every time I’d drop my arm in a normal swing, it would grab cadence (or something), as the numbers would drop down into the 60-70 range. Lift the arm and hold it steady, and BPM would rise into the appropriate 135-150 range. Of course I looked ridiculous in the gym holding my arm so I just made do with bad data this time.

    I’m not sure there is anything really to be done about this, but it does feel good to at least vent about it.

  67. Chris Furner

    Almost sold on it. Make it track steps and I’m there.

  68. chris

    If you get the chance could you see if it works on a rowing machine?
    My dad got a Polar OH1 for himself after finding the below link of it working on rowing machines and it seems to work alright on the ergo, unlike the Rhythm+ which doesn’t work (tried numerous positions for ages) and has a panic attack, it would be nice to know if the Scosche can now also cope with rowing machines or other more complex use cases.

    link to polar working:
    link to analytics.rowsandall.com

    • Fred B.


      The Rhythm24 and Rhythm+ should pair via BLE or ANT+ to your rower. Try upper arm placements (triceps & biceps) for potentially better accuracy, as your forearms might be flexing hard to hold that grip.

      Let us know how it goes.


    • Louis Matherne

      I’ve used the Rhythm+ with Concept2Rowers but it may require one of the newer performance monitors, i.e., PM5.

      Most importantly, it did not work well around my wrist. The intense pressure on and off at the wrist gave me abnormally high heart rate readings. I ultimately settled on using a chest strap. Putting it on the upper arm might make a difference. I haven’t tried this.


    • Fred B.


      We recommend the forearm or upper arm for placement of the Rhythm HRM’s, as the wrist isn’t a great spot, especially during activities. Too much “noise” for the sensor to be accurate on the wrist.


    • Louis Matherne

      I typically wear it as high up on my arm as I can get it. This seems okay. I do wear it on my wrist occasionally while cycling and generally seems okay although I have seen some odd spikes from time to time.

  69. Philippe Sudan

    Could you clarify the “Frimware update” does it mean online or I have to send the device in.

    Based on your feedback and others I bought late last year the Rythm+, it has 3.1 on it. I am struggling to get proper reading as my HR is much lower than my Suunto Ambit 3. I found out that there is some issue with 3.1 and need an upgrade to 3.3 but can not be done remotely and need to send the device in. For me this is a major issue I am in South Africa and courier will cost more than a new one. I can’t understand with today’s technology that Scosche did not plan remote update, useless as far as I am concerned.

    Will it be the same case with Rythm 24?

    • Scosche’s more recent units do enable user updateable firmware (even the Scosche Rhythm+, depending on when exactly it was produced).

      Same goes for 24.

    • Jed

      “Scosche’s more recent units do enable user updateable firmware (even the Scosche Rhythm+, depending on when exactly it was produced).“

      Hi Ray,

      I have their crude app on iOS11, but see no way to get to 3.3 from 2.6. Could it be, that my rev/production-date Rhythm+ is simply too old?!? How do I determine that?

      I haven’t yet paired it with my iPad Pro 10.5″ via BLE, and yet to pair it with my Galaxy Note 4 via ANT+ & BLE, hopefully both work well and are well supported for that -quite old- smartphone model.

      So maybe this is why I don’t yet see any way to update to the newest firmware?


    • Jed

      Ray, got a minute? Thank-you very much:
      link to dcrainmaker.com

    • Jed


      I’m guessing I misunderstood your post, & you actually meant “no-one” can update OTA to 3.01+ at the moment, as it’s been removed from v3 of the iOS app (not sure if same applies to the v3? Android app, though I suspect it would), due to some issues with the 3.01+ fw.

      And as 3.3+ is pre-release fw, it’s also not -yet- been made available via the app. Hence, only way to get it if you “really” want 3.3+; is to ask your local Scosche if they’ll flash it for you, & give you access to their next-gen beta app?

      With that in mind, I sent this (below) to Scoshe Australia, I fully expect to be ignored, they don’t even provide a number, just a crude web-form!

      Do you think this is the way to go, is that the ONLY way I can update from the ancient v2.6 fw that’s on my brand new Rhythm+? Not sure why my unit came with such an old version, must’ve been sitting in stock for yrs, major retail chain here in Australia recently had a big clearance sale of old stock.


      I’m trying to update to 3.01+ of your firmware, but in your latest Fitness Utility app (3.0 on iOS) you have removed the ability to update to it, as there’s some issues with the 3.01+ fw!

      Supposedly there’s now a 3.3x+ firmware, but one has to send their unit to Scoshe if they want to test that version for Scosche!

      Can I send my unit in to have it updated by you, & can I test that new firmware alongside your new app? The app is supposedly coming within ~3mths, at the same time as the firmware.

      The app is REALLY terrible at the moment (at least on iOS, I haven’t tested Android yet), I really hope the new one is hugely improved! I can provide lots of useful feedback towards that aim.

      Why on earth don’t you guys have a support number? A web-form is really really unprofessional & unfriendly!!


    • Yeah, Scosche removed 3.1 as you noted (full thread here with Scosche peoples): link to dcrainmaker.com

      Scosche does follow along here in this thread, though perhaps by now comment notifications are going automatically into a Clutter folder. I can poke them and see if they’ll swing back here on making the firmware available again in some manner (perhaps like Wahoo does, which is with a code required – i.e. ‘newfirmware’ to access it).

    • Jed

      Hi Ray,

      If you could it’d be very much appreciated, they’re way more likely to respond to you…

      No number here in Oz (just a terrible web-form), though in the warranty disclaimer in the manual it suggests we can call a US no. or use a US email for Support/Claims etc, so I may try that at some point.

      I’d love to be able to grab their 3.3+ firmware OTA, but if the current 3.0 iOS app doesn’t expose most of it’s features/fixes, then I don’t see the point!

      So hopefully if they give me access to the beta fw, they’ll also give me access to their next-gen beta app for Android & iOS?

      If it’s all still WAY too flakey then I’m happy to hold-off (though I’d like to be given the option to jump to at least 2.62), but if they’re at a point where it’s all relatively usable with some glitches here & there, then I’m happy to put up with that & provide feedback etc.

      So long as there’s a way to leave the beta fw & app if I’m getting too busy, & just need rock-solid stability.

      Thanks mate!

    • Jed


      See my prior post, did you hear anything from them yet?
      link to dcrainmaker.com

      Predictably, Scosche Australia have professionally ignored my web-form query.
      I may have to stay-up late tonight so I can call Scosche US.

      Thanks again/BR.

    • Jed, apologies for your trouble with the webform.

      Please contact me directly at rhythm@scosche.com (ask for Steve to respond), and I will try and help.

      Steve (Scosche)

    • Jed

      Hi Steve,

      Please carefully read my post above to see what I’m wanting:
      link to dcrainmaker.com

      Is this do-able to any degree, or not possible at this stage?

      At the very least I’d like my unit to be upgraded to 2.62;
      By dropping/posting it somewhere to be manually flashed.


    • Jed

      Hi Steve,

      Any special reason why you ignored my post…
      I responded to yours within a few minutes of you posting it, see here:
      link to dcrainmaker.com


    • No reason, Jed. My workload only affords me the ability to jump on here occasionally. I thought you might email me and I’d be able to respond to that more frequently.

      We did have a firmware upgrade available thru the Fitness Utility App for a short time, but we discovered some problems and are addressing them now. So to prevent users from experiencing these problems, we removed the upgrade.

      We also recognize that the Fitness Utility app is not up to par with expectations and not representative of the Scosche brand… so we have been working very hard to finish the new Scosche Sync app that will be available in the Apple App Store very soon and for Android soon after. It will come with a firmware update for R+ and will function with both R+ and R24.

      I appreciate your patience and encourage you to contact me directly with any more questions.

      Steve (Scosche)

    • Jed

      Hi Steve,

      Emailing you now, as this doesn’t fully address everything.


    • Margie Maloof

      The Android app is terrible also. I’m on my second rhythm 24. Three attempts to use. Much workout time wasted!

  70. Perry

    For cached data, what is the max amount of HR data at 1 sec intervals that can be cached before having to download to a watch or phone app?
    For instance I have a Suunto Ambit3 that has the chest heart rate strap which allows 3 hrs of swim time before the memory is full and having to download the data back to the watch. What is the max amt of data with this strap?
    I’d like to pr it with my Suunto Ambit3 and them take the watch off and rock/ice climb without my watch on my wrist as it is too intrusive.
    Will it work for Sleep for a whole nights worth of HRV data? I do not wear a watch to bed.

  71. Peter

    Any chance this could track kayak stroke cadence?

    • We haven’t tested that specifically, but I don’t see why not. Should work the same way as detecting your run cadence.

      Steve (Scosche)

    • Peter

      Competitive kayak and surfski is admittedly not a huge market but the primary current option for a cadence sensor is from Vaaka dot com and it runs about $225 on its own and does nothing but cadence. If the Rhythm 24 can track stroke cadence it would be a great alternative.

    • Sounds like a great idea. It would be great if a rowing enthusiast on here could test it out for us and report back results. Any volunteers? Email me at rhythm@scosche.com

      Steve (Scosche)

  72. Chad

    I’m confused. How does the Scosche 24 interact with my Fenix 5x on swims? If I pair the 24 to the Fenix, will it then send all data to the Fenix at the end of the workout, followed by the Garmin uploading the workout to Connect and then onto Training Peaks. Or, do they record data separately which then needs to be uploaded to their respective apps and combined further down the line.

    Furthermore, what data is the 24 collecting that will be shared with the Fenix? Will it be redundant or are they recording different things during the swim (aside from heart rate)?

    I haven’t worn my Garmin HRM in the pool because there’s no good way to keep it from sliding down and I’m really excited about the 24 if it works well in the pool. I have the old “+” and it has worked great for me for a couple of years.

    On a side note, I do think it’s funny, a community that will strap anything and everything their bodies from footpods to giant wrist mounted computers and crazy blue tooth ear buds, is offended because an armband that appears to be a game changer doesn’t fit their modern sense of style.

  73. Phil Jacques

    Hello Ray;
    Thanks for the comprehensive review of the Rhythm 24. With the addition of memory, and the LED zone indicator on the device, this seems like my perfect solution.

    I am a very active 74-year old male, and my primary (sole) interest is in HR monitoring/HR training. Tracking other metrics was relatively unimportant to me. The accuracy of the HR sensor was paramount. I had considered the Tickr-X, because it reads electrical pulses, and by many is considered the “gold standard” for wearables, especially in the high intensity range. (I understand Fitbit is being sued by users who claim that their device seriously understates HR during high intensity sessions).

    Hoping to avoid the more inconvenient chest strap option, I was pleasantly surprised by your comparative study showing that Scosche’s accuracy was very comparable to the Tickr-X right through your training session. (It was hard to read the graph, but is that correct?)

    I am excited to try it…placed my pre-order with Clever Training today.
    One final request. Can you tell me the app that generates this screen?
    2018-01-09 06.38.17 (img 12 of 19) I couldn’t save the image
    And the graph

    • Thanks Phil.

      So far, I continue to use the device in testing, and things are mostly pretty good. Some minor beta quirks as always, but no red flags of yet (and these devices are early prototypes from December no less).

      Regarding that screenshot, it’s from the beta Scosche app.

  74. Kannan Kanagaraj


    I recently bought Suunto spartan sports wrist hr baro, but I am having difficulty getting accurate HR readings when doing my crossfit sessions (WOD). More over I would like to wear a wrist band for stability while doing weight lifting. So thinking of buying Scosches Rhythm 24, with that I can leave the watch in gym bag and do the workout with just Rhythm 24 on my upper/mid arm.

    My question is, will this band connect to my new Suunto watch ? I think they will as both support Smart bluetooth. Would you please confirm this ?


  75. Mike Van Koevering

    Really enjoy your reviews. Thanks for the great insights and recommendations.

  76. Tempo36

    I want to love my Rhythm+ but the only place I can wear it is my upper arm, and even then I have to crank it so tight that I would almost call it a tourniquet. If I don’t, it works well up until I start pushing hard and then suddenly it just drops out and starts feeding some imaginary steady heart rate around 60-70 bpm (see the attached screenshot of today’s attempt to NOT tourniquet my bicep….any guesses where I stood up and started pedaling hard or any guesses where I gave up and cranked it down?)

    Anyone else have this kind of problem with the Rhythm+?

    • Mark

      I never had good results on my bicep due to slipping. For me, it works flawlessly on the top, left side of my forearm, about 3 inches down from my elbow bend. I’m always amazed at how optical sensors work differently for everyone.

  77. Mark

    Anything new on a release date?

  78. Sam B

    Hi. Thanks to all the info! If paired with my Garmin 935 will I get more accurate instant walking and running pace from the Rythym 24 that I would get from the watch alone?

  79. Sam B

    Hi. If it will work as a foot pod to give you more accurate instant pace, would it need to be calibrated occasionally [as most foot pods need calibration]?

  80. Just as a minor update for those following along in the comments section…

    Scosche handed off a final production unit to me at Sea Otter this weekend, so i’ll begin testing on that. They’ve entered full scale production and plan to ship in the first 7-10 days of May (roughly what they’ve said for the past month or so).

    More to come…

  81. Bart

    Found the new Scosche App. In the Apple store ?. Rhythm SYNC. by Scosche

    • Rich

      The new app lets you update the firmware on the Rhythm+, and from an initial hour-long test I’m not seeing the dropouts I was getting on the previous firmware. It’s way too soon to say it’s fixed, but I’m quietly hopeful.

    • Giles E

      It appears geo-locked or similar…. I’m in Germany and can see the app on the apple website on my PC, but it isn’t visible nor available in the app store.

    • For instructions on how to update the firmware on the Rhythm+, please view this video: link to youtu.be

      If you run into any issues, please contact me at rhythm@scosche.com

      Steve @ Scosche

    • Thanks for the heads-up about the problem accessing the Rhythm Sync app in Germany, I will look into it and get it turned on there. It is English only language at this time, but there was no intention to have it blocked in Europe… probably just an adjustment to a setting in app store.

      Steve (Scosche)

    • MirkoSurf&Run

      I can’t find the Scosche Rhythm Android app in Google Play

    • Jed

      They’ve always said it would be a good few months behind the iOS app.

    • Jed

      I’d love to be able to do that, but as per the email I’ve sent to you, I can’t on my iOS device!


    • Jed

      As per my email to you, it’s also not Showing in the Australian app store, or wasn’t, haven’t check for ~10hrs. TY/BR.

    • Steven Knapp


      You’ve got mail. seems also some filtering issues that prevent it from being seen from an iPad (even when filtering for iPhone only apps). I was able to use your old app on my iPad Mini4, unsure what would prevent the new one from working. Perhaps just a filter setting?

      I was one of the folks who took the 3.01 update and the unit has been unreliable. I’ve been patiently waiting for the update/fixes for some time.


    • Jed


      For an answer to that, see my response to Kevin here, read the email thread I pasted:
      link to dcrainmaker.com

      Not coming to iPad until/if Apple ever brings Healthkit support to them.

    • Steven Knapp

      Thanks Jed..

      I’m really disappointed by this… I just want my HR strap to work. I just need a firmware update away from the broken 3.01 release. I don’t need anything fancy, nothing supporting Healthkit etc..

      I thought it was rather respectful to wait ~1yr for their new app understanding that they didn’t want to put resources into the old one.

      I suspect somewhere they made the decision that there aren’t many users who upgraded to 3.01 who don’t have an iPhone. And that it isn’t worth putting the effort into supporting those users.

      If that’s the case, the + is the last Scosche product I’ll buy.

    • Jed

      There is workaround/fix in this thread or the rhythm+ one, it explains how flash to the older/non-buggy fw. It’s quite long-winded/complicated, but it sounds pretty important to you so it might be worth the effort.

    • Steven Knapp

      Jed, 3.01, for me, has just not been reliable. I’ve had times where the device locks up and I needed to put it on the charger. Other times where it stops sending HR and I need to restart it. Is it the end of the world? No, but frustrating none the less.

      I saw the downgrade instructions, agree it’s complex. It would have been nice if Scosche provided a similar solution over the last 10 months to resolve this.

      Instead I’ll find a friend with an iPhone and mooch their device for a few minutes to update the FW now that it’s out.

  82. Good news for UK/Europe Folks!

    I’ve finally got a link for Clever Training UK/Europe for the 24! Ask (a bunch) and you shall eventually receive: link to clevertraining.co.uk

    Don’t forget for readers to add the 10% coupon code at the end, DCR10BTF, so that’s totally applicable here.

    In terms of general availability, I’m working to get clarity on what those ship dates are. It sounds like the production ramp isn’t exactly happening as fast as Scosche would want, but that things should be shipping very near-term, but that fulfilling all backorders may take a bit of…May.

    As for my review, I’m using a final production unit with either final software or release candidate software. They’ve had two minor revisions to it in the last couple weeks. My hope is that once they lock that down and give me the word the software is gold, that I’ll publish a review within about 7 days. I’ll likely only use data sets from the last week, versus data from all winter on prototype devices (I often rode/ran with it in Australia Jan-March). Merely since it’s only logical to use final hardware/software. The software I had on that device was from back in December (with equally old prototype hardware).

    In any case…more soon!

    • Riccardo

      Unluckilly I can’t buy it from Clever Training UK/Europe: my address is not accepted in any way.
      I also contacted the credit card company to get exactly how it’s written, but it doesn’t work anyway on that site.
      I also tried to write to them, but was ignored.

      I’ll wait for Rhythm 24 to become available from Amazon or other sites that I use with my credit card at least daily without any problem at all.

      Do you have an idea about when it’s be available or at least preorderable also on other sites?



  83. Gryphon


    Any insight on this latest news from Clever Training regarding this product?:

    “Dear Clever Training Customer

    Thank you for your pre-order for the Scosche Rhythm 24 Heart Rate Monitor. We regret to inform you that these units will not be arriving as previously scheduled. During a final quality control inspection, before being shipped to our warehouse, the manufacturer discovered a minor issue that prevented units from being dispatched.

    This was an unexpected turn of events and we share in your frustration and curiosity. At this time, we do not have any details regarding the reason for delay nor an updated confirmed shipping date. We will continue to work closely with the manufacturer and keep you up to date on any new information.”

    • I received roughly the same thing from Scosche’s engineering team directly. What CT sent matches what I received. It sounds like a minor hiccup, more than a big issue – but hoping to get a bit more clarity. Already sent an e-mail back, but tripling down on timezone delays (Europe to Pacific to Asia) don’t help with things.

  84. Jaques

    Seems to be some problem with the release. Received a message from Clever Training…

    “… During a final quality control inspection, before being shipped to our warehouse, the manufacturer discovered a minor issue that prevented units from being dispatched.

    This was an unexpected turn of events and we share in your frustration and curiosity. At this time, we do not have any details regarding the reason for delay nor an updated confirmed shipping date.”

  85. David

    Ray, do you feel if you can state if you have confidence this new unit is at least as reliable / accurate as the old Rhythm+ prior to your full review hitting? I only ask because I preordered day 1 with CT and now with the latest message and unknown new timeline I’m beginning to be concerned that what was to me a nice little version 2.0 of an optical strap is turning into a whole other beast that perhaps I should have waited for your review to come out first before I ordered…

    • Without getting too deep into the weeds, the issue that’s held things up isn’t a software/optical HR/etc one, but rather a simple mechanical/case type issue that they need to resolve where in the production line something went amiss. Units shouldn’t have come off the line with that defect from a QC standpoint. I suspect it’ll be a case of days before resumption of production.

      As for accuracy, overall it seems on-par with before. I saw some bugs earlier this winter on the pre-prod unit, but things are looking nice on the prod unit. I think there’s actually one or two data sets on the prod one in my Fitbit Versa review I published a few hours ago. And you’ll see more data sets shortly in my Suunto 3 Fitness review too.

    • David

      Thanks, its been easier to be patient on this product because I have both wrist based optical HR and conventional chest strap solutions that work today but I just felt the technology and time was right to completely replace my chest strap with the rhythm for the more “difficult” workouts like biking or intervals, and use the wrist based for steady state runs or when i just don’t want to bring anything but the watch. i think i’m ready to be done with chest straps except for maybe strength training and even then i’m cautiously optimistic the Rhythm 24 will be good enough. My preorder stands lol…

    • Marcus

      From initial thoughts, would you think it would be worth holding out for over say a Tickr? I have just picked up a Tacx Neo and am planning on an Apple TV 4K soon. I’ve an old Ant+ Garmin HRM but thinking of going all Bluetooth for simplicity.

      If it would be best to hold out and pick this up I’ll do the Mobile Companion trick from my android to link in my Ant+ HRM in the meantime.

    • thesasquatch

      Just received this

      Dear Clever Training Customer

      Thank you for your pre-order for the Scosche Rhythm 24 Heart Rate Monitor. Last week our pre-order notification indicated the units were pulled back last minute and were unable to be processed as originally expected. Since last week, we have been working tirelessly with the manufacturer for updated availability. Based on the most recent information, we look forward to fulfilling orders the beginning of June.

      We do not have any specific details regarding the original reason for delay. However, the manufacturer has assured us that the quality control trigger has been resolved and these units are ready to be placed in your hands.

      We will continue to monitor the status of our incoming shipment and keep you up to date through our weekly update until your order has been processed and tracking details provided.

  86. Justin

    How do I tell my head unit to ignore the cadence signal from the Scosche? I have dedicated cadence sensors in my Powertap P1 and I’d rather trust those than worry bout conflicting data. Any ideas?

  87. Erik

    Are there any updates on when this will be available? The longer battery life, and ability to store data seem worth the wait. However, if the wait is indefinite, leaning toward the Polar OH-1.


  88. Anirudh

    Do you know if the Rhythm24 only supports running cadence upload to their own app? Or does it also upload to 3rd party apps like Strava? This limitation exists on the Wahoo Tickr Run, so I’m curious.

  89. Kannan Kanagaraj


    Do you know whether Rhythm 24 will connect to Suunto Spartan watches using smart bluetooth sensor ?


    • Yes. In fact, most of my testing of the 24 day to day is with a Suunto Spartan.

    • Kannan Kanagaraj

      That’s awesome, another reason for me to wait for this product. Thanks.

    • Kannan Kanagaraj

      Hey Ray

      When can we expect your full review on the final product ? How is the HR monitor better than Suunto spartan sport series as both use the same Valencell technology ?
      One thing I find it frustrating in my Suunto optical HR is that, it doesn’t read my HR as I have lot of hair on my hand (including wrist), only solution is to shave it around the place where I wear the watch. Hope this will go away with Rythem 24 ?



      Hey Ray

      For this test, were you wearing it mainly on the forearm or did you try them on biceps/upper arm as well ? Are the straps very secure if we go for HIIT classes ?


    • Almost exclusively on the upper arm/bicep for me. I hate it down lower on forearm, feels/looks stupid to me. No issues there.

      As for a review, once they start shipping basically. I’m on a final prod (software/firmware). The hold-up is merely them sorting out a case related issue on some units coming off the line. It doesn’t impact the underlying product.

      As for difference to Suunto, it’s actually the exact same sensor as the Suunto 3 Fitness (and newer than some, but not all Spartan units, I’d have to dig up my notes). There’s a bunch of differences, mostly around new potential features companies like Scosche could leverage. Plus a few years worth of accuracy updates.

      Most importantly though, it’s really just placement. I’ve been going head to head between the Suunto 3 Fitness and the Scosche 24 on runs/rides, and the Scosche universally does better. Reason? Purely placement. I have no doubts if I placed the Suunto on my upper arm, it’d be flawless too.


      Thanks, You are so correct about the placement. I have Spartan Sports Baro watch, in which HR consistently works fine only if I wear on the underside of my wrist. But even that goes off when hand/wrist gets sweat. If I wear it more tighter, then I might cut off blood flow to fingers 🙂

      I am really looking forward to Rhythm 24, hope wearing on upper arm will hold tight when doing high intensity workouts.


      Hey Ray

      Now that Clever Training have started shipping, Would you please publish the full review on the final product.


  90. Kannan Kanagaraj

    Hey Ray

    When can we expect your full review on the final product ? How is the HR monitor better than Suunto spartan sport series as both use the same Valencell technology ?
    One thing I find it frustrating in my Suunto optical HR is that, it doesn’t read my HR as I have lot of hair on my hand (including wrist), only solution is to shave it around the place where I wear the watch. Hope this will go away with Rythem 24 ?


  91. Will

    Hi Ray,
    Do you know when the Rhythm 24 will be available in the UK? Shipping from the US seems to be expensive.

    Many thanks


  92. Jim T

    Ray mentioned clever Training UK/Europe for the 24!

    Don’t forget for readers to add the 10% coupon code at the end, DCR10BTF, so that’s totally applicable here.

  93. Will

    Many thanks. I have ordered one now from Clevertraining UK. Delivery expected mid June.

  94. David

    My Clever Training Scosche Rhythm 24 order just shipped. It’s a day 1 black version order.

    • Bikeman

      CT just shipped my blue version as well.

    • Nighthawk700

      Mine shipped too. I’ve been searching the webs to see if there was a manual on line, but haven’t seen one yet. Has anyone seen one? [Yes, I’m a RTFM type of guy, don’t judge me! 😉 ]

  95. Jaques

    Strange… these are now shipping, but I’m not finding a product listing on the Scosche.com website.

  96. Jaques

    Ummm… no Android support? Only crApple? Any plan for Android? Otherwise… I won’t even open the package.

    • Jed

      I & others have answered this Qn so many times now…

    • Nighthawk700

      Just opened mine up and read the manual. So I can’t even change this to the “Run” mode without having the Android app. Now I see the concern the others were having. Hope the Android app (that was supposed to be out toward the end of May) comes out before the return period for the 24 gets close.

    • Jed

      No it wasn’t supposed be then, it was always ~3mths after the iOS app.

    • Nighthawk700

      I said May based on a response from Scosche, link to dcrainmaker.com So when was the iOS app released? I got this from Clever Training, so I have 60 days before the return period to see if this can really do everything it’s supposed to.

    • Jed

      I posted excerpts from an email exchange I had with them in a few places but can’t find it now, can’t waste any more time on it. iOS app came out roughly a mth ago, maybe a bit more.

    • Jed

      I reckon it’ll be another mth “tops”, prolly sooner, but worst case 2mths…

    • We have always said the Android app was approximately 2 months behind the launch. We understand the frustration and are trying to release a Lite version of Android app in the next week, with the full version coming in August. In the meantime, you can use it out of the box in heart rate only mode, transmitting to your mobile device via Ant+ or Bluetooth, or if you have a sport mode selector on your device and can connect via Ant+, when you change modes on your device, the R24 should change as well. This only happens in Ant+. I will post on here when the Lite and full versions are released.

    • Nighthawk700

      Steve @ Scosche, you said “if you have a sport mode selector on your device and can connect via Ant+, when you change modes on your device, the R24 should change as well. This only happens in Ant+.” I just paired my R24 to my Garmin 645, via Ant+. Does that mean if I use “Run” on the Garmin, it’ll set the R24 to Run mode, or is the Sport Selecter something else that I’m misunderstanding? Worse comes to worse, I know a few people with iPhones, and I might be able to ask one of them if I could borrow it to change the mode. Only downside is they love ragging on the Android platform. Thanks.

    • George A Kalogeris

      Just checked:
      In multisport mode in my Fenix6pro, when the sport changes, the Rhythm24 mode changes as well !!!
      Nice, very very nice.
      What would be nicer is auto-recording when swimming is engaged…

    • Paul S.

      Not nice. When I put my Rhythm24 in HR only mode, I expect it to stay there. It’s annoying to have to tell my Edge 830 that “yes, I really want to use the actual cadence sensor, not the Rhythm24” each and every time.

  97. Chris Furner

    So I just got mine yesterday from CT, and promptly went for a run this AM using the Rhythm 24.

    My first thoughts are that this thing is real comfy. Especially later in the run when I am getting winded, the arm band is more comfortable than the chest strap that I have been using for years.

    I felt that the HR data was accurate, maybe a little low but I have not run in 3 days and it was 50F outside.

    However after the run, when I saw my data, I am concerned.

    My Garmin 920XT calculated 140 kcal for a 11.3 mile run at a 8 min/mile pace. This is totally inaccurate. It should be around 1200-1300 kcal based on my recent similar efforts. I examined the HR data that was recorded, and it looks to be accurate, there are no dropouts or spikes. The numbers all look good. So I am not sure what would cause this calorie count to be so far off.

    Also, I did have the strap in “run” mode, and had set up the Rhythm 24 as the cadence source. The cadence data is totally off as well. Garmin reported a 22 spm average. Similar recent efforts using a Garmin foot pod and HRM-RUN Garmin HR strap are in the ~170 spm average.

    Garmin Recovery Advisor also gave me a 0 hour recovery time at the end of my run. I would expect it to give me a ~48 hour recovery time for a run of this distance based on my experience with this feature.

    My Garmin 920XT is running firmware version 9.70

    I have pulled the FIT file off the watch and will be submitting a ticket to Scosche. Wondering if anyone else has seen anything like this yet.

    Neat product, but I think there is something that is not calculating properly somewhere with Garmin or Scosche.

    • Paul S.

      I took mine out cycling this morning and go the same “0 hour recovery” message. When I received it yesterday I put it in cycling mode, but this morning had a change of heart and had real trouble switching it into heart rate only mode. I tried numerous times with the app, and each time it flipped back. I don’t think I ever got it to switch because my Edge 1000 asked me which cadence sensor I wanted to use.

      I’m going to try “heart rate variability” mode next (if I can get it to switch) just to see if getting (fake?) variability data fixes the recovery time. There’s no description of the modes anywhere I can find, though. That and the fact that I use an old Garmin hardshell chest belt (which doesn’t transmit variability data so far as I know) makes me think that something else is going on. (Maybe you need to build up historical data for each individual HR sensor?)

    • Bikeman

      Took it out for the first time today. A short hour & a half easy ride. Heart rate data way under my usual numbers. Have owned several HR monitors over the last 30+ years and still own seven so I know what the numbers should be. I wore it on my upper arm just as I did with the original Scosche. I’ll try it on my forearm tomorrow.

    • Ed S

      I received the Scosche 24 from CT yesterday and used it for a 12 mile ride on my road bike. I too saw bad calories – way low, about 110 after a 45 min ride. The 24 was paired to my Garmin FR735XT. The heart rate seemed very reasonable, but didn’t have a way to really test. The cadence results seemed reasonable as well.

      Good idea about sending FIT file to Scosche.

    • Jaques

      I caught your posting about two hours into a six hour ride. I, too, noticed the heart rate was much lower than my chest strap. I had the Rhythm24 on my upper arm (paired to a Wahoo Elemnt). I switched it to just above my elbow. Better numbers and matching close to my Garmin Fenix 5 (not paired to anything). I’m using the stock setting out of the box, but I use Android (can’t change any settings on the Rhythm24). I read there is a bike mode for the Rhythm24… but, need the app to change that setting. Waiting for the release of the Android version of the app.

    • David

      Chris: if the Scosche was reporting the wrong cadence to Garmin (22!) that could account for why the Garmin calculation was so far off even if the HR was correct? Try it in HR only mode (not ideal obviously if you wanted to use the cadence feature) and see if it makes a difference for now…

    • Chris Furner

      Yeah good point. That is probably part of the issue.

      I dont really care about the cadence feature. I have used a Garmin footpod for years without any issue. Don’t mind continuing to use it. All I really wanted was a more comfortable heart rate monitor.

      Planning to use the Rhythm 24 tomorrow for a bike ride. Ill run a second computer with a Garmin HR strap to compare charts and averages.

    • We have been testing with a ForeRunner 230 to confirm our understandings.

      * Calorie data is provided by the Valencell chipset in the R24 and it is ALSO calculated in the FR230.
      * Calorie data is only transmitted from the R24 thru ANT+ when in Running Mode. This is a limitation of ANT+, not a decision by Scosche or Valencell.
      * Calorie data is not transmitted in any mode other than Running Mode and it not transmitted via Bluetooth. Again, a limitation of the ANT+ and Bluetooth protocols, not a decision by Scosche or Valencell.
      * Calorie data is recorded on the R24 when you record your workout. You will need to upload the FIT file after your workout to see the calorie data.
      * The FR230 is making its own calorie calculation internal. This appears to be a proprietary Garmin algorithm. We are not sure what data they are basing the calorie calculation on, and we confirmed it differs from what the Valencell algorithm is outputting.
      * We have alerted Valencell to the difference and are asking for clarification on their algorithm used to calculate calories.

      I would also like to note, I understand with an an Android device and therefore can’t change modes on your device without an available Android app. And you will be unable to upload a recorded FIT file from the device with an Android app. We are still working on the Android app and plan to release a Lite version in the next week, and the full version in August. In the meantime, if you have your R24 connected via ANT+, when you change your device to Running Mode, it will tell the R24 to switch to Running Mode. Then you should be able to receive the Valencell calorie data transmission.

    • Brian

      @Steve, thank you for engaging in this thread. There are numerous issues with the R24 that go far beyond the cracking case– thought that is very serious. I am a huge fanboy of the Rhythm+, and I have been looking forward to my R24 since it pre-ordered it upon announcement. To add to an earlier post, these are all the things that stopped working with my Garmin 735XT when I switched from my R+ to my R24 last week:

      * Training Effect = 1.0 for all runs (used to vary based on workout intensity)
      * Recovery Time = 0 for all runs (used to vary based on workout intensity)
      * Performance Condition graph missing from Garmin Connect
      * Calories understated compared to prior runs with the R+

      Just looking at the above 4, something is missing or wrong in the data transmitted from the R24 to my Garmin 735XT, and based on other posts, it is not just this watch model.

      One of the huge features I wanted was the swim capability– to capture HR data in my swims the same as Garmin’s HRM-Swim and HRM-Tri. Currently, it is not working, and I found it impossible to get anything of use out of the R24 in a swim. I tried capturing a swim in the device (which is cumbersome, and not something I would ever do outside of this experimenting.)

      * Swim HR cache & forward to the Garmin does not work
      * Swim internal capture in the R24 timestamp wrong (off by 4 hours)
      * The net of the above is that the swim HR feature and data are useless– I could not fix the file, merge it into my Garmin FIT file, or do anything to view the data. And, it could not be viewed in the context of my swim workout intervals.

      These all seem like easy firmware fixes, and I hope that they come out in the next couple weeks so that I continue using my R24 without the currently degraded performance I am experiencing.

    • Chris Furner

      Thanks for the reply.
      I am not sure that totally makes sense on calorie calculation. You say this only happens in running mode, but I am seeing the same inconsistency in cycling mode as well.

      I do not have any calorie calculation issues using this same Garmin 920 watch when using other third party heart rate monitors. I even have a cheap Chinese no-name ANT+ strap that I paid less than $10 for on eBay, and it is giving me accurate calorie calculation on my Garmin 920, both when running and cycling.

      There must be some what to get the R24 to work the same way. Uploading a separate file just seems like too big of a burden when there are other products out there that work seamlessly.

      My casing is also cracking. I emailed the support email address that you provided. I opened a ticket through your website almost a week ago and no one ever responded to that support request. Hopefully going direct to the email address yields better results. I am leaning towards just returning for a refund but I might stick it out until a firmware update comes out to see if this improves performance.

    • Fred Brooks

      Jaques – through the ANT+ connection, your Garmin watch with change the mode of your Rhythm24. This works for Running and Cycling modes. And Rhythm24 LED will change from Blue (or your current heart rate zone) to Purple while the Rhythm24 resets to the new activity (a few seconds).

    • Simon

      Useless on swimming is the most accurate review I have seen so far. I echo that base on my experience with R24 and Fenix 5X

  98. Roger Dennis

    Anybody figure out how to get connected as a biking cadence sensor?

    • Roger Dennis

      I know see it connected as I linked it as a heart rate monitor, maybe it does cadence automatically when this is done, will check on the road in the am

    • Paul S

      You need to put it in cycling mode. Then it will be visible as a cadence sensor as well as an HR sensor.

    • Roger Dennis

      Went for a two hour ride, heart rate seemed very good, cadence awful, seemed to show heart rate rather than cadence or some radom number always higher than actual cadence (but would find accurate cadence for a few minutes also randomly)

  99. Chris Furner

    Yep this thing is NOT accurate on the bicep. I hit the spin bike at the hotel for a few minutes. 4 on the bicep and 4 on the forearm. HR jumped right away when I moved the strap to my forearm. Went from 105 to about 120 bpm as soon as I moved it. Not a big fan of this as I cannot keep the strap stable on forearm without making it overly tight.

    I don’t think this is the source of the calorie issue, as even at the lower HR the calories should be many times higher.

    • Chris, everyone’s anatomy is different. The optical sensor sees blood perfusion in the capillaries in the tissues under the skin. Try moving the sensor around the upper forearm, the bicep or tricep areas until you get a reading that is accurate for you.

  100. Mark

    Garmin 935 is seeing the Scosche 24 only a cadence sensor, not HR sensor. Seems to show HR data. Getting ready for 1st run with those two and Garmin RD pod (from which I expect to get the cadence data.

    Any idea on how to get the 935 to see the 24 as an HR unit?

  101. David

    3 workouts done so far… 1 strength training, 1 spin cycle, 1 outdoor run. All in HR only mode, all worn on my forearm below the elbow with the device on the outside of my arm.

    1st the strength training… I normally use a Polar H10 paired to my Apple Watch S3 since the built in optical HR in the Apple Watch is next to useless when lifting weights (so was my old Garmin). I paired the 24 to the Apple Watch (easy as could be) and it did an “ok” job. It did hit on all my intervals but with significant lag (the wrist based HR would actually go down before) and I suspect it missed some of my peak HRs on some of the sets. It was close and to be honest if I didn’t already have a chest strap I probably would be ok with this but I suspect in the future I will continue to wear a chest strap for lifting as it picks up sets instantly and with no lag (although I do wear electrode gel with it to help.)

    2nd the spin bike: This worked great paired to both the Apple Watch and an older Garmin Edge 510 I have permanently mounted to the spin bike. The Apple Watch did ok with wrist based optical but was very slow to pickup intervals, the 24 seems to get them nearly as fast and as accurately as a chest strap and I can use both my ANT+ and Bluetooth devices at the same time. I’ll be curious to see how this works on my hybrid outdoor bike because wrist based is useless with a bumpy road but I *hate* wearing a chest strap hunched over on a bike, it always slides on me.

    3rd the outdoor run: This was a steady state run with the Apple Watch and while the Apple Watch does well 90% of the time for me (and other times inexplicably has periods of time where it is very off or just records nothing) the 24 seems dead on with a nice gradual build over 30 minutes just like I would expect and even recorded my high near max HR at the end when I went all out for the last 1/2 mile. Intervals will be key but it was very comfortable to wear and didn’t slide at all.

    Some last thoughts?

    1. I’m glad I waited to get this instead of the original Scosche because with 24 hour battery life that means I can charge the device once every week or two instead of once every few days which makes it easier to justify “one more device” to deal with.

    2. I’m glad I got a device with ANT+ and Bluetooth rather than one or the other.

    3. The strap works GREAT and is easy to adjust. The device stays put and is comfortable. The strap does get damp from sweat and I imagine it might be a good idea to get a 2nd strap so I can change it out to dry or wash sometimes.

    4. I paid the $99 premium vs. the others at $79 to get the latest Valencell tech and 24 hour battery and so far it seems very good to me. I know there are a lot of other features here that many of you will want to explore like storing workouts for later transmission, cadence etc. but I can only comment on HR so far.

    It was a LONG wait of 6 months from when this was announced but it seems a solid product.

    • Alex T

      Thanks for posting. Weird about the strength workouts.

    • David

      These optical HR units always struggle with strength workouts. When I am deadlifting, doing rows, overhead press, bench press etc. my forearms are engaged and the muscle movement in the arm throws off the sensor. I have not yet tried it on my bicep or tricep so maybe a different position for wear would improve things. That said it is far better than the wrist which when engaged (basically it always is except for running lol) causes huge inaccuracies with watches etc.

    • Alex T

      Ah, I see. Thanks!

  102. Paul S.

    First real comparison test here. This was a road ride with the Scosche on my bicep in cycling mode. Garmin hard shell chest band and Garmin magnetless cadence sensor paired to my Epix, Scosche both HR and cadence paired to my Edge 1000. Both Edge and Epix paired to the Garmin magnetless speed sensor and the PowerPod.

    HR looks very good. As for the cadence, it looks OK, but it was immediately obvious that the Scosche will never get 0 cadence right, since there’s always going to be some other signal to grab its attention. When I stopped pedaling, the number started to wander rather than going to 0. Still it looks pretty good considering it’s being taken on my arm.

  103. Fred

    I have now received my Rythm24 and have used it for a 19mi run. Heart rate is good and comparable to what my Rythm+ would have recorded. I used it as it came out of the box. No change in settings through app.

    I used it with my Garmin Forerunner 230. The following things do not work (yet):

    1. Calories – only showing 376C where it should have been in the range of 2,000C
    2. Training Effect – only showing 1.0
    3. Recovery Time – 0 hours

  104. Chris Furner

    I set up another test today.
    Approx 13 miles on the bike.
    Rhythm 24 on my forearm, paired to a 920XT in Cycling mode. Rhythm 24 in HR only mode. Rhythm 24 cadence sensor un-paired from watch. Also paired the watch to a magnetless cadence sensor.
    Also ran a Garmin HRM-RUN chest strap, paired to a Edge 520. Paired to same magnetless cadence sensor.

    Both devices were set to no auto-pause, and were started/stopped at the same time.

    All data matches up, HR data looks pretty close on both units. However the calorie numbers for the Rhythm 24 are very low still. Rhythm 24 gave me 62 kcal, Garmin chest strap gave me 449 kcal.

    There is something wrong with these device. I do not think it is my devices based on others that are seeing the same issue. This seems like something that Scosche would have noticed in beta testing.

    Ray, have you had any communication with Scosche regarding this issue? I entered a ticket but so far no response.

    • I haven’t, it’s on my to-do list to validate my results and then circle back with them either way.

      For me I’ve largely been using the Scosche 24 with Suunto products for running tests (wearables), and then for cycling tests I’ve been using with the Garmin Edge series.

      I don’t tend to look at calories much to be honest, so I’ve gotta circle back and see what those values look like on the various devices.

      That all said – the last time folks had odd calorie issues was when the original Rhythm+ came out, and Scosche had to do a small firmware update to address it on certain 3rd party devices.


      would you please publish your reviews – I am thinking of cancelling my pre-order now. Looks like HR is not accurate as compared to their previous model.

    • Chris Furner

      I would recommend waiting. I am probably going to return mine, I also have some for team members and I am going to recommend they return theirs as well.
      I might look at the Polar unit, or just stick with the chest strap.
      Luckily I bought from Clever Training so I know they will be understanding with the return.


      Glad you replied, I just emailed them back to cancel my order. Hopefully they will honor it and do the refund.


      Done just cancelled it !!, such a shame, I was waiting for this product since this review was published.
      Hope they will fix all these niggling issues in the next firmare update.


      Just ordered Polar OH1, Not sure whether I will move to Rhythm 24 now. Hope OH1 syncs well with Suunto spartan sports watches.

  105. Bart

    Has anyone tried the Swim HR upload? I tried it with my FR 935 without any luck I put the device in swim mode It’s paired to my FR 935 and I also tried recording the workout. I think the issue might be after the workout if you go to view the current workout the date is off by 6 hrs if you save the workout then the date gets updated to whats on the phone.

    • Bart

      Confirmed with Scosche support the tech’s device was also off on the timestamp of the device 🙁

    • Jeff Tignor

      I swam with mine this morning and got the same result. No sync of HR to my 920XT and the time stamp was off when I synced the workout to my phone from the strap afterwards.

    • Bart, we are looking into the time stamp discrepancy Should have a fix soon. We’ll push it through the Rhythm Sync app.

    • Abel Bourbois

      Hello Steve @ Scosche,

      Any update on the swim issue with FR935? I just got my Rhythm24 and was super excited that it gave me real-time HR data during my swim. However, I was super annoyed that it will not pair that HR data to my swim workout. I just got the device yesterday and my firmware is fully up to date.

      Please help!

      Abel B.

  106. Jaques

    This seems to be a creeping trend… releasing products to the consumer market before the product is ready.

    For the Rhythm24… no Android app… which means… no way to install a firmware update to fix what is broke. (This is starting to read like the Hammerhead Karoo and some of the Garmin devices.)

    I’m back to wearing my Wahoo Tickr chest-strap. I’m not getting paid to beta test Scoshe’s product for them.

    • David Lopez

      totally agree with you.

    • Jim T

      What a shame to see the units shipped with no Android app available. I waited a long time for this and even delayed on buying a chest strap but as I am both Android and Garmin user I won’t be purchasing.

    • We understand the frustration and are trying to release a Lite version of Android app in the next week, with the full version coming in August. In the meantime, you can use it out of the box in heart rate only mode, transmitting to your mobile device via Ant+ or Bluetooth, or if you have a sport mode selector on your device and can connect via Ant+, when you change modes on your device, the R24 should change as well. This only happens in Ant+. I will post on here when the Lite and full versions are released.

      Regarding any firmware updates, I know the workaround isn’t popular, but if you can have a friend with an iPhone download the Rhythm Sync app, it’s fairly painless to pair and update the firmware of your R24 on the borrowed iPhone.

    • Margie Maloof

      Is the Android version going to work with Motorola phones or just Samsung. I’m hoping that I misunderstood this on the scosche site.

  107. Tim T

    Received this product last week. Wore it on a 3.5 hour ride, and it worked great. Went for a run with it the following day, and it suddenly came loose 2 miles in. When I examined the sensor, I discovered that the plastic on the unit broke at one of the corners that hold the pins for the strap. The only upside is that I wasn’t doing an open water swim because the sensor would have been on the bottom of a lake with me left to wonder what happened. Very disappointing! I’d like to know if anybody has experienced this problem…

    • James

      I just had this happen to me. While sliding the strap over my forearm, a corner of the plastic casing cracked, releasing the pin and the strap. I’ve only used the unit a couple of times and was putting very little pressure on the strap. I wonder if the manufacturing issues that caused delays has not been fully worked out. Very disappointing.

    • James

      Blerg. Uploaded wrong photo. Here’s the crack.

    • Fred

      When I saw your picture I checked mine under a magnifying glass: it’s developing the exact same crack on the same corner!

    • In case Scosche doesn’t answer by morning, I’ll circle back to them and the other issues folks have raised (primarily calorie ones) over the last few days and see what they say.

    • Timothy F Thompson

      This is the exact same thing that happened to mine…

    • Fred

      This is what I got back from Steven Sawyer (Product Development Manager) regarding the Garmin Calorie, Recovery Time and Training Effect issues:

      “We have been testing with a ForeRunner 230 to confirm our understandings.
      Calorie data is provided by the Valencell chipset in the R24 and it is ALSO calculated in the FR230.
      Calorie data is only transmitted from the R24 thru ANT+ when in Running Mode. This is a limitation of ANT+, not a decision by Scosche or Valencell.
      Calorie data is not transmitted in any mode other than Running Mode and it not transmitted via Bluetooth. Again, a limitation of the ANT+ and Bluetooth protocols, not a decision by Scosche or Valencell.
      Calorie data is recorded on the R24 when you record your workout. You will need to upload the FIT file after your workout to see the calorie data.
      The FR230 is making its own calorie calculation internal. This appears to be a proprietary Garmin algorithm. We are not sure what data they are basing the calorie calculation on, and we confirmed it differs from what the Valencell algorithm is outputting.
      We have alerted Valencell to the difference and are asking for clarification on their algorithm used to calculate calories.

      I would also like to note, I understand you have an Android device and therefore can’t change modes on your device without an available Android app. And you will be unable to upload a recorded FIT file from the device with an Android app. We are still working on the Android app and plan to release a Lite version by this weekend, and the full version by Aug 1. In the meantime, if you have your R24 and FR230 connected via ANT+, when you change your FR230 to Running Mode, it will tell the R24 to switch to Running Mode. Then you should be able to receive the Valencell calorie data transmission.”

      I have now connected the R24 and my FR230 via ANT+ and the issues seems to be resolved.

      I have also already informed Steven of the crack issue and sent him my picture.

    • Timothy F Thompson

      This is a photo of mine…

    • James Taft

      Thanks, Ray. Upon closer inspection, I see that the other corner of my unit is also cracked, so if the corner to the upper left of the serial number hadn’t given way, the corner to the upper left would have given way soon. Given that my unit has two cracked corners (both on the serial number side), and several other folks are reporting cracked corners, it seems likely that it’s a design or manufacturing flaw, and the question is what percentage of units are affected.

      Clever Training has been fantastic about arranging a return. I’m torn as to whether I should try a new unit or wait to see if kinks need to be worked out.

    • Marcus

      Had been holding out for this as wanted a dual HRM for Apple TV and Zwift but also use with my Edge 1000 and 910xt.

      Think I’ll go with a Wahoo as I was also looking to record time and heart rate data for gym Spinning and Circuit classes and load up to Garmin Connect and Strava afterward rather than having to wear the 910xt.

      It’s a pitty. Time to decide what option to go for now…

    • James Taft

      To correct the typo above, both corners to the upper left and right of the serial number are cracked.

    • Marcus

      ….. as an Android user

    • Nathaniel Benke

      If I had to take a guess, this issue is likely due to the case design and torquing of the bolts. New production line and I bet the torques are out of control leading to the extra pressure and cracking on these corners. So far my unit it ok, fingers crossed…..

    • JH

      From Scosche –
      We have received a few concerns with cracking issues on our recently launched Rhythm24 heart rate monitor. We take quality very seriously at Scosche and want the best experience for our customers. For anyone that has a Rhythm24 with a cracked base, we will issue you a replacement unit at no cost. To receive your replacement unit, please contact Scosche Technical Support at (800) 363-4490 and select option 3 to be connected to a Customer Service Representative. You can also reach us via email at customerservice@scosche.com.

    • Chris Furner

      I would like toi know if/when the calorie calculation issue is going to be resolved. If that is a long way off, Ill just RMA the strap to Clever Training, rather than get a replacement from Scosche that still does not work right.

      Also, Scosche was engaging directly with users on this website in the past. How come once the issues start, they go silent? It would be very helpful for us and them if they were to address these issues directly. I have heard nothing back from them regarding the ticket I opened with them last weekend.

    • tt

      Appreciate the offer, but you have a design defect on your hands. A replacement is not going to solve that problem.

    • We have received a few concerns with cracking issues on our recently launched Rhythm24 heart rate monitor. I am very sorry for those of you that are experiencing this issue.

      We take quality very seriously at Scosche and want the best experience for our customers. We have done extensive testing and have worked very hard to make sure defects like this don’t happen. We have not seen any cracking case issues on any pre-production units, off-tool samples or through pilot production. Early mass production units also tested well.

      We are doing everything we can to identify the cause of the defect and how many units escaped our quality controls. We are working to accomplish this as rapidly as possible. And we will absolutely make it right for every one of you, and correct the problem moving forward.

      For anyone that has a Rhythm24 with a cracked base, we will issue you a replacement unit at no cost. To receive your replacement unit, please contact Scosche Technical Support at (800) 363-4490 and select option 3 to be connected to a Customer Service Representative. You can also reach us via email at customerservice@scosche.com, or contact me directly at stevens@scosche.com


      Come on Scosche !!! You can’t release such a product to the market. You should take all these products back and redo the design. Such a shame.

  108. Nathaniel Benke

    Can anyone confirm if the new unit will fit on the old version charging dock? My unit came with a broken charging dock and in between the cost of returning the new unit and waiting for Scosche to warranty I am at a complete loss.

    • Fred

      No, it doesn’t fit. The new contacts are slightly farther apart.

    • Nathaniel, please contact customer service and we will send you a new charging cradle free of charge.

      (800) 363-4490 option #3

      or email me directly at stevens@scosche.com

    • Nathaniel Benke

      Thanks for the reply Steve, I was able to get a hold of someone in customer service and they sent me a new charger ASAP that I received Friday. Now that I’ve been using the device for the entire weekend, I am really happy with it. No signs of cracking and no signal dropouts.

  109. Kelly

    I’ve been a rhythm user for years. Been on a few runs with my new Scosche Rhythm 24. It connects to Zwift just fine, with no dropouts, through my ANT+ dongle. HR tracks a little higher than with my old Rhythm+ . However, when paired with my Fenix 5s, I get dropouts continuously. Like every 20-30seconds. I have updated my watch, rebooted everything, unpaired, re-paired, fully charged, etc. I have no idea what is going on. My watch has no issues connecting to any other HR sensor, including my other Rhythms and my garmin strap. Any ideas??

    • JH

      I would say make sure your strap adjusted to be snug and the placement on your arm is correct (forearm or upper arm). If the center LED is purple it means it isn’t getting a good signal and you may need to adjust your positioning on your arm.

  110. Brian

    Ray, thank you for your review and all of the insights. I pre-ordered mine from Clever Training, and I got it last week in time for my long run on Saturday. And today, I took it on its first swim. I was hoping that it would cache and forward the HR data to my 735XT for the swim, but I got no HR data in the Garmin file. You mention above that the swim feature may have been in beta and not available yet.

    Have you had any updates from Scosche or even experienced the feature during your in-depth testing?

    I spoke with a Scosche support person today who was very helpful and did some research inside to follow-up. However, he said that the only method to capture swim HR data was to manually put the device into “Swim” mode from a mobile app and then capture the activity inside the R24 via the little button. This pretty much won’t work for me, since I would probably forget one or both steps during my swims. I just want it to work with my Garmin watch the same as with an HRM-Tri or HRM-Swim.

    • Bart


      I think you’ll have the same issue as well if you put your device in swim mode and record the activity you are going to find the timestamp of the activity will be several hours off and will not match the activity of your watch. If the timestamps don’t match then it will not be imported into your swim activity. My other observation is the unit does not feel very durable (cheap) not sure I am going to keep this one 🙁

    • Alex

      I’ve been experiencing the same frustration. I bought the R24 mainly as an option to capture HR data in the pool, but the store and forward function does not seem to be working. I’m using a Garmin 735XT to record the workout, and the separate R24 heart rate only file is no good to me since the R24 doesn’t include lap count, pace, etc.

      I will probably return the R24 to Clever Training unless I learn of a firmware update that fixes this problem. From reading some of the other comments, it sounds like it could be something to do with an incorrect timestamp on the cached data during the swim mode?

      Any updates on this?

    • Brian

      I have been trading emails and phone calls with Scosche tech support and product management. I encourage you to contact their tech support as well to add some customer momentum. There is definitely confusion on Scosche’s end about the importance of the swim HR feature.

      I tried to capture and use the swim HR file today, and it was totally useless. It will not load into Garmin Connect or Strava for any kind of useful visualization, and I tried all the Internet FIT tools I could find to try to correct and merge the R24 file to no avail.

    • Alistair

      I bought mine specifically for swimming HR with my Fenix 5, so pretty disappointed to receive it today and find that retrieving cached HR isn’t working. It searches and searches but no luck! Is this just broken or was it never actually meant to work?

  111. Chris Furner

    Yep mine started breaking during a ride yesterday. I have worn this thing 4 times max.

    This thing is NOT multi-sport ready.

    Returning to Clever Training, and I will advise my team members that have them to do the same. Between the questionable HR accuracy, the calorie calculation issues, and the device falling apart after very light usage, the Rhythm 24 is useless to me.

    • Jaques

      This really pisses me off! >:-( I live in Japan. Such a pain in the ass to make a return. Plus, the $30.00, I paid for shipping to Japan.

    • Jaques, if you are experiencing a cracked case or other manufacturing defect, please call customer service and they will take care of you, even in Japan. You may also contact me directly at stevens@scosche.com (see my other posts regarding this issue).

    • Jaques

      Thank you, Steve!

    • EM

      @Steve @ Scosche — Amazon USA estimates the 24 will be available beginning next week (6/14). May I order with confidence that the units in the Amazon batch are not from the batch that has case cracking issues?

      The case crack issue is the only thing holding me back from an order. I am glad that you have a good replacement plan in place, however I don’t want to deal with the hassle of a replacement. I also don’t want an exercise device that I have to treat with excessive gingerness to avoid breaking it — I want to be confident in its ruggedness so I can forget about it, not concerned about its frailty and monitoring it for possible loss while swimming, etc.

  112. ming

    Hi Guys,

    I am running into some issue with the HR reading when the strap is set to HR mode.

    1. my watch ( suunto Ambit2s) is having issue reading the heart rate, once in a while it will read but it is constantly dropping off. The strap has no issue pairing to the watch. my garmin/wahoo/suunto chesty has no problem at all with the watch.

    2. When i download the file from the strap via the ios app, export the file and send via emails, and manually upload the .fit file to Strava. The heart rate data is missing.

    If i share the data to strava via the app, the heart rate data is present. why the manual upload would not work?

    Can someone give me a pointer on what i need to do? Thanks.

  113. Robin Markowitz

    This got me SO nervous! I thought all of them were cracked from the assembly line. I use mine mainly for an unusual purpose: sleep tracking (which was also supposed to be a mode in the app, I had read). Anyway, I thought my unit, which arrived about 4 days ago, was SURELY cracked after those pictures. I beta test for Sleep As Android because of several sleep disorders. I am a “violent ” sleeper, restless legs syndrome and so forth. I thought I surely must have cracked it the other night. Only the Scosche Rhythm+ stayed on all night, and by the time this new one arrived, my skin had wounds on it from all the tape I used to keep that horrible Velcro band attached every night.

    So, I got the magnifier going, took every conceivable picture, and it is not a universal manufacturing defect affecting all units. Nor does it feel “cheap.” Even if it did, it works and is not cracked. I have included one of many magnified pictures below: no cracks anywhere.

    I was very relieved because I was waiting and waiting for them to finally release it. I sure wish they had an iPad app, though. That’s disappointing. iOS is better with Bluetooth in fitness apps than Android, which is my phone. Tomorrow my iFriend will lend me her iPhone to upgrade the iFirmware. 😉

    I have one question: where does one place the device for running cadence? I was thinking of getting an old Polar footpod until I discovered this can actually do it. And so you just tell your favorite app to capture running cadence? Because that was a no-go for cycling cadence. I tried it right out of the box going 20+ mph. Didn’t pick it up. It recognized a cycling cadence device but no numbers. I went back to my Wahoo bike shoepod.

    I am interested in taking it into the park for a run and an idea of how I’ll do in a 5 K. I usually run on an indoor device. It’s like a treadmill.

    Anyway, no cracks and night before last, I beat the dickens out of the thing during an RLS episode.

    • JH

      Robin – to capture cycling cadence it needs to be in Cycling mode, and to capture running cadence it needs to be in running mode. To change modes you need to change modes within the Rhythm sync app. Right now only iOS is out, but a light version for Android should be out next week. The Light version will allow you to change modes, but I don’t think it will allow you to update firmware. Full Android app is due sometime end of August.

    • Chris Furner

      Cadence in those two modes has not yielded anything accurate for me, so do not spend too much time fiddling with it until a firmware update.

    • Paul S.

      I’ve found it pretty accurate except when I stop pedaling. Then the Scosche just doesn’t realize what’s going on. If I could switch it out of cycling mode (it switches back when I use the iOS app), I’d do that. As it is, I have to tell my Edge 1000 to switch to a real cadence sensor. For HR it’s been as accurate as my Garmin hardshell HR belts.

    • Ed S

      I used the R24 in a 1 hr spin class yesterday and cadence from the R24 matched what the computer on the indoor bike read. I’m impressed, because it’s hard for me to get my head around how a device placed on your forearm can figure out what your feet are doing! The HR readings I’m getting seem reasonable.

  114. JH

    link to youtu.be
    Here’s a link to a video instruction manual from Scosche.

  115. Happy

    EM wrote:
    [quote]The case crack issue is the only thing holding me back from an order. I am glad that you have a good replacement plan in place, however I don’t want to deal with the hassle of a replacement. [/quote]

    It’s great to see Steve from Scosche participating in this thread and attempting to do the right thing, but I think EM raises a fair question that deserves an answer.

    Has Scosche identified the cause of cracks?
    What has Scosche done to resolve the problem in manufacturing?

    If Scosche is just saying, “Well, most don’t crack so we’ll just continue to ship and replace any that crack free of charge while we determine the root cause of the problem,” then I think EM is correct and, like him, I don’t want any part of this product. I’m not a lucky person when it comes to this sort of thing.

    • “What has Scosche done to resolve the problem in manufacturing?”

      Since this popped up on units to people, they’ve:

      A) Paused all manufacturing
      B) Issued stop-ship notices to all retailers with stock, asking them to zero-out the inventory and cease any further shipments until they figured it out, even for stock on-hand for backorders. All existing/unshipped stock will be returned to Scosche.
      C) Setup an e-mail and hotline number for existing impacted customers
      D) Offered on the spot replacement with known-good units to existing customers
      E) Also commented up here a fair bit, including personal e-mail addresses to e-mail if support is somehow failing (as it seems).

      Obviously, they don’t yet know why (or haven’t shared why) the cracking is occurring. My guess is what a few people noted above around over-torque of that bolt causing it (thankfully an easy fix if true).

      Given what Scosche is doing, I’m not sure I can blame them for not putting in a good effort to get to the bottom of it. One can blame them for it slipping past QA somehow, or that the Android app isn’t ready, or perhaps even the calorie thing (though, I suspect we’ll find that’s a trickier beast due to the way Garmin handles it).

      But I think they way they’ve handled the issues seems legit. I’m sure they’ll either share the cause of the issue or that it’s been rectified. The fact that they’ve asked retailers to effectively kill any inventory of units and ship them back is a pretty big step.

    • Happy

      Great info! I have to take off my hat to the way they have handled this whole thing from the start (no question replacement including postage, Steve’s participation here at DCR, etc.).

      If I were Scosche, I’d have broadcast from the mountaintops the info you shared here because it puts them in a very good light.

    • Andrew

      I’d like to know if the initial delay in shipping was due to the manufacturing defect? I’m waiting for the android app before making a decision on which optical HR to purchase to replace my Mio Link.

    • It was previously noted the initial delay was due to units not passing QA testing coming off the line (it was totally unrelated to case cracking however).

    • Chris Furner

      I have been trying to reach Scosche for about a week now, with zero response back from them. Any other option like a personal email address or something?

    • Just scroll a bit up, or, direct to this comment link: link to dcrainmaker.com

    • MikeDozer

      I there any way serial number range that were pulled out? I hope i dont buy flawed one :/

    • Mike

      Not sure that has been the case. Bought my unit 3 weeks ago ( mid July) and spindle support bracket failed. Would have thought that issue should have been resolved by the time I purchased it judging from the above statement. Not totally convinced that problem has been resolved.

    • Mike

      I must say that Clever training and Steve at Scosche have been very helpful and am getting the faulty monitor replaced rather than refunded. I’m sure the replacement will be fine. More than satisfied with customer service at both the company’s

  116. Margie Maloof

    Just bought the rhythm 24. Pros:. Heart rate seems very accurate. WAY more comfortable than a chest strap, immediately synced to my Garmin watch. Does have to be spit on:. During the winter, my chest strap doesn’t work well because my skin is so dry!
    Cons:. The scosche site! I got very frustrated looking for scosche Android app (looked for a long time), only to find out on your site that there wasn’t one yet! I also tried to register my band, and it took me to the survey! After reading the comments on this site, I’m concerned that it’s more fragile than it should be!
    Overall, I like wearing a watch, so I wanted it as a substitute for my chest band. I’m happy with it…Can’t wait for the Android app, but, again, thanks to this site, my frustrations have been relieved!

  117. Nighthawk700

    Did my first run with the Rhythm 24. Can’t say I’m overly impressed with the recorded HR. I do Galloway “Run / Walk.” So in this instance, I ran 40 seconds, walked 25, repeat until done. I don’t know if that was the cause or something else, but my FR 645 kept losing the R24. I also didn’t get a “Performance Condition” until half the run was over. I did have the R24 on opposite arm of the FR645, but they’re what, a yard/meter apart at the furthest? (using Ant+) It’s further to my opposite foot where I have the Tempe. I guess I can give it another try with them both on the same arm next time. And I did slide it from the forearm to the bicep to see if a different location would help. Guess I should have thought of trying the same arm as well while on the road, but didn’t hit me until just now.

    • Nighthawk700

      Whoops, thought I hit Ctrl-V. Sorry. link to connect.garmin.com

    • Nighthawk700

      This time I did a run with it on the same arm as the FR 645. No problems with the heart rate. And it offered to link up the Foot Pod too, I didn’t get that offer last time. But it never got a Performance Condition rating, and the Aerobic/Anaerobic is suspect. (0.1 / 0.2) link to connect.garmin.com Still evaluating, and waiting for Ray’s review.

    • Joel

      I agree. I am quite annoyed with the Performance Condition rating and the Aerobic/Anaerobic work feedback. Mine is running in HR mode only which my Fenix 5x is picking up fine, but for some reason the data at the end of my runs shows irrational workout feedback (related to performance condition and Anaerobic/Aerobic work). For clarity, it registers the HR data fine and shows min, max, average HR in a sensible way. What I don’t understand is how the data should be any different to any other external HR monitor than the garmin fenix 5x is receiving as I would have thought the Ant+ data was just “dumb” bpm data. So why does the watch see it as if i have done close to zero work. Is it Garmin’s fault from misinterpreting the “dumb” bpm Ant+ data, or Scosche’s fault for sending “odd” bpm data?

      Ray or Scosche, any help understanding this and how this can/should be corrected is appreciated.

  118. Steve Hardy

    Maybe you can help since Scoche won’t respond to my support questions. My workouts from my band are 5 hours off (earlier) than my phone/Fenix 3. I haven’t seen a way to manually adjust the time stamp. Have you found a way to do this? Isn’t helpful when trying to sync a workout when it occurs at 6 am and the band is at 1 am.

    Also, I will set the mode to swim via iPhone, press record and then also be using my Fenix 3 to swim. The workout downloads as an HR Only mode workout. Is this occurring because my watch and band are paired and it is overriding the mode setting from the phone?


  119. John Verhoeven

    I’ll be honest: I was this week on the edge of ordering an UK-send Scosche Rhythm24 to the Netherlands to use with Garmin Fenix3. But after reading the issues in software, hardware, and even cracks in housing, I don’t feel comfortable anymore. Still I regret this situation and hope it gets resolved really soon. It’s a shame a product with such potential fails on so many aspects. As a consumer it would be stupid to buy it without assurance this will be dealt with in professional manner. I’ll await the reaction of Scosche when I can order this product with proper assurance I can use it without having fear it will fail…

    • Paul S.

      So far for me it’s worked well for both heart rate and cadence (except for the trouble detecting zero cadence correctly). No cracks at all. Still, I’ve stopped using it for now. I find the arm band just as uncomfortable if not more as the chest strap I’ve been wearing for years. I don’t pay much attention to recovery time, but reporting a zero recovery time is clearly wrong. Apparently being paired to an Edge flips it into cycling mode automatically, and I don’t want that because I already have working cadence sensors on all of my bikes, and having to switch sensors to the one on the bike is just another annoyance. So for now I’m back to the Garmin chest strap. Still I’ll probably use the Scosche on occasion, probably bring and use it if I travel with a bike, and I’ll definitely try it in the winter for cross country skiing.

  120. David Lopez

    The quality of this device is below average, this is pathetic, a worthless designer, what a worthless manufacturing. I lost the device while swimming, I guess and I can only guess by the same issue many guys are having. I have send them an email asking for another device (not sure if that may fix the issue) most likely not, or calling the credit card and ask for the money back due to a lemon product. While I say lemon, it may be the whole production. Seriously if anyone was thinking about buying it, just don’t, make yourself a favour and don’t buy it, just for the hassle is not worthy. I live in the uk, so the batch here also have issues.

    Stay away out of this product!!

  121. Margie Maloof

    Follow up:. Been using rhythm 24 for almost a week. When I try to pair it with my vivoactive he, it doesn’t initially say “external hr,” but throughout the workout, it vibrates periodically and says”external hr.”. I’m not sure whether that’s a watch or scosche issue. I take a lot of cardio strength classes and it seems to drop off intermittently, but comes right back on. I’m concerned that I am going to break the scosche strap. When I put it on my bicep, it seems too tight when flexed, and I can’t adjust the strap without taking it off. I’m mixed about whether I’m happy with the scosche….I definitely don’t miss my chest strap!

  122. Peter St.

    Starting with simple question. If I use Rhytm paired with my watch and do running, is there any benefit to heart rate readings if I switch Rythm from heart rate mode to running mode?

    I’ve received my Rhythm 24 couple of days back and thus far I’ve used it for 1 roller skiing activity and 1 walking (both placed on my outside left upper forearm), 2 runs (outside right upper forearm). Thus far I’m unimpressed and close to being disappointed. Will try the gadget on my biceps to see if that improves the readings. For all except waking I’m comparing to Garmin cheststarp (I’m a 935 owner).

    For roller skiing and walking I used the heat rate only mode while for runs the running mode. My observations:
    1) there was one big extended HR spike in the middle of roller skiing (45 min ride, spike around 20th min) without any reason;

    2) during walking I paired the Rhythm with my watch. And during the walk there were several HR spikes again without the reason (from ~65 to even 120);

    3) during my shorter run (25 min), there was some elevated readings and spike around 6th min (again, no reason) while the rest was +- OK;

    4) in my linger workout with shorter and longer speed sessions and intervals the Rythm was doing OK for first 2 tempo runs, then got a bit jittery during 3rd and 4th (having kind of OK reading and then jumping some 15 bpm higher than the strap), it missed a bit 1st out of 8 following intervals, while during the other 7 it was 15-20 bpm higher than the strap. That’s a lot in my opinion. And for some strange reason this activity was split in 2 activities when I downloaded activity in the app.

    If I compare short slow run and walking to the performance of 935 optical, then unfortunately Rythm is behaving for me at the moment. I hope that placing on the biceps helps

    • Peter St.

      Small update. Placed R24 on the outside of my right biceps and readings increased significantly.
      Parallel runs with my 935 and Garmin chest strap & R24 in run mode:
      1) 45 min workout with small climb and some strides. R24 did a good job of mimicking chest strap;
      2) 25 min short run with couple of small climbs – again good performance!

      3) 25 min run with only R24 in run mode paired with 935 in ANT+ and no chest strap. One spike and 1-2 dropouts in the beginning. Then it seemed OK.
      BUT – after run Aerobic TE = 0.0!!!
      Now, this is TOTALLY &%$#$#. Basically it means that I can’t use R24 or my Training load metrics will go down the drain 🙁

      Has anyone found a solution for training effect problem?

  123. Margie Maloof

    Follow up from initial comment:. I’ve used my rhythm 24 with my vivoactive hr for about one week. First, when I hit cardio on my watch, it doesn’t always say “external hr” initially, but it will keep vibrating periodically to say it. I’m not sure whether it’s a watch issue or a scosche issue. I initially wore the band on my forearm, but I worried I would break it during planks. I moved it up to my tricep, which seemed to work, but feels very tight when my bicep is contracted. Because of everyone else’s comments, I’m very worried that it’s fragile and I’m going to break it! Once it’s on, it’s hard to adjust the strap, and I also feel like this type of strap will get looser with time. Overall, it seems to give me an accurate hr (at least zone wise….I’m excited about an Android app, where I can compare it to my watch. In general, I like it, but I’m scared I’m going to break it or lose it!

    • Margie Maloof

      I’ve been waiting patiently for the Android app to come out. I just looked on the scosche site and unless I’m misunderstanding, it looks like the app will only work with certain Android phones, primarily Samsung. Does this mean that I won’t be able to use it with my Motorola phone?

    • Hi Margie – a bit of detail from Scosche in the comments section on this. Linked here: link to dcrainmaker.com

  124. Gryphon

    While we all wait for Ray’s In-Depth review, I thought I’d add a more moderate and positive review of the product for those out on the fence. As we all know, displeased people post far more comments than pleased people.

    I’ve been using the R24 for indoor cycling workouts since receiving my pre-order from Clever Training. In that time, I’ve used it alongside a Wahoo Tickr strap that’s been bomb proof for a couple of years. This is all anecdotal (perhaps I’ll get a daypass to the DCR Analyzer sometime) but the two track very closely. I have never seen the two more than 3 BPM different. I think I may see the R24 go up slightly more quickly and perhaps to be slightly slower in lowering, but always within that tight range. I would also say that the R24 seems to be more sensitive because I’ll notice it go up a beat and then down a beat, while the Tickr will just stay steady.

    I wear the R24 on the outside of my left upper forearm. I find the device to be comfortable, I have the strap adjusted tight enough to produce solid readings but not to the point of being overly constrictive. I have not notice any cracking issues on the back at all. I’m not sure if I’m just lucky and got a better unit, but I also tend to be kind to my property, i.e. I don’t tend to overtighten, slam cabinets or drawers, drop things to the ground from a foot up, etc.

    For what it’s worth, my take on the calorie issue, or any tech issue for that matter, is that it can be easily remedied with firmware fixes. Let’s not forget, most of the negative comments so far have come from people that pre-ordered a new piece of tech. If one doesn’t have the patience to wait for the kinks to be ironed out, it’s probably best to not be a launch customer for a new tech product. Even Apple, beloved by most, usually has to release the x.1 version fairly quickly after the release of any new iOS. There is every reason to believe that the folks at Scosche will iron this out as they did with their previous version.

    I fully realize that my experience with this product is quite limited in scope, but based on that experience, I wouldn’t hesitate to recommend the product to someone if its features ticked enough boxed for them.

    • tt

      You would have to be crazy to buy this unit right now. Even if the firmware issues were ironed out, it still has a defect that causes the case to crack and the strap to release. I can deal with issues that pertain to firmware. As you point out, all new tech typically requires a window to resolve outstanding issues. What I cannot tolerate, however, is a piece of equipment, tech or otherwise, that breaks within days of initial use. If you do own one of these already, do not wear it in open water. If it falls off in a lake, you will be completely SOL.

    • I think Scosche will probably post shortly, but in talking with them yesterday, it sounds like they found the cause of the manufacturing machine issue that was resulting in the cracks (and thus potentially the strap to release). They believe it was limited to specific batches of early-run units, and have resumed shipping of new units that have been double-checked from a QA standpoint.

      Software/firmware issues are of course a different boat, but perhaps not as simple as a boat as people want them to be due to the complexities of how different watches handle HR from a calorie standpoint.

  125. Gordon Goodtimes

    Out of curiosity, where are folks putting the Scosche when swimming? On your arm? Or leg? Trying to envision how I might wear it in the pool.

    • Patrick Utrecht

      Not sure if they will enable cadence under water (swimming strokes) but depending on type of swim it will only work accurate on arm (cadence wise). For the rest it won’t matter much probably

    • Gordon Goodtimes

      Thanks, Patrick. I am only interested in getting the HR, as my 935 will do most everything else I need. Anyone else swim with it somewhere else i.e. around your upper leg?
      For those who swim with it on your arm, does it stay on ok through freestyle strokes?

  126. David Lopez

    We all know by now about the defective production about scosche 24, my scosche 24 broke while swimming and it was gone forever, I contacted scosche thinking they will send me a replacement, after all it was a lemon product (lemon item most likely) but they said not. I have to contact the credit company because the transaction very recently and most likely I will get the money back. Just to let you know when you buy from these guys you aren’t getting a warranty. Amazing. My recommendation would be to stay away even further than sugar. Clevertraining doesn’t take responsibility of this device, many scosche24 are lemon of the production line. What a horrible dreadful team Scosche and Clevertraning are.

    • Hey David-

      I guess I’m a bit perplexed. At the time you posted this comment on the post and my YouTube video, Scosche had already agreed to send you a replacement unit (in fact, without even offering proof of purchase). They did that about 8 hours prior to your comment publishing. Even moreso, they offered to FedEx to to you (which is set to arrive tomorrow).

      Concurrently though, you had contacted Clever Training too. Given you had no product to give back, they were operating at a bit of a loss. But they too also offered to send you one free of charge, just to ensure you were good to go.

      Thus I don’t understand how either company is a ‘horrible dreadful team’. In fact, it seems like both companies did their best to get you sorted as fast as humanly possible, including international priority FedEx shipping on a late Friday afternoon. Also, despite your comments otherwise, both companies went well beyond any warranty expectations.

      But again, perhaps I’m missing something (though after detailed conversations with both entries following your complaint, I’m 110% sure I’m not missing anything). Cheers.

  127. Dan Kroboth

    I’d like to add in my two cents, which are that I’m quite happy with the product I received in the end. The arm band is great, and I’m happy with the responsiveness and accuracy. Yep, looking forward to a new firmware release, but nothing I can’t live without for a few months. Much better than a chest strap!

  128. All right guys, this is Steve from Scosche. We have been debating how much of the little details to share with all of you, but based on the frustrations with us, there seem to be some misconceptions and jumping to conclusions and I want to clear that up.

    To start, know that we are taking all of your concerns very seriously and our entire team has been consumed with making this right for all of you. Immediately upon hearing of the problems being reported, mainly through this blog and you all as customers, we made the decision to offer a no questions asked, no cost, warranty return and replace. We wanted everyone to know we were going to take care of them.

    Note: “no questions asked”?? Well, we have to have some proof you actually bought a Rhythm24, what color you bought and we need your address. So maybe a couple of questions ; )

    Some background: We have had multiple rounds of off-tool samples produced during development for testing. We used and abused them and never experienced cracking. We had a successful pilot run in early March and yielded hundreds of units. Again, no cracking. This is not a design issue. It is a manufacturing issue. That is an important point, I want to be clear. We had our first mass production run in late April / early May and as you all remember those were delayed due to a quality issue. At that time, we discovered there was a problem with the gasket installation in the assembly process that allowed the gasket to twist when the covers were screwed together and if that occurred there would be water leakage if submerged. We decided to quarantine that first shipment until we worked out the issue. Those parts are still quarantined, we corrected the problem with an improved gasket and more rigorous waterproof testing on the production line and waited to ship the next production batch. Know that the units that you all received from Clever Training were from this batch. This was our first shipment released for consumer sales and it was given priority and drop shipped directly to Clever Training, so you all would be the first to receive the Rhythm24.

    Since we discovered the defect causing cracks, we have been doing non-stop testing and analysis of the design, the defective parts we have received back from you guys, and our manufacturing process. We have determined it is a manufacturing defect called a “weld line” that occurs during the injection-molding process. When the molten plastic flows around the charging contact pins, the flow splits around the pin and rejoins on the other side. The leading edge of the flow is a bit cooler than the rest of the plastic and when it rejoins it can cause a line of weakness. This weld line is where we are seeing cracks. Weld lines are sometimes seen in the first parts of a production run before the machine has completely warmed up and stabilized. We typically throw away a number of first parts during a production run. Some of these parts clearly made it through our quality controls and into the parts we shipped.

    Also immediately after discovering there was a problem, we quarantined all inventory at Scosche, and at our distributors, until we determined what happened and the extent of the problem. And although many of you have been very frustrated, disappointed, upset and vocal about this problem, there was a relatively small number of defective units reported. We also pulled a very large sample of units from our quarantined batch at Scosche and re-inspected and tested them. We did not find a single unit that was cracked or that we were able to crack in destructive testing.

    We know there may still be some defective units out there, but we decided to release the current inventory and continue to offer our no-hassle, no-questions asked warranty return and replace. If you experience any problem, we will send a call-tag for the return and replace at our expense to wherever you are in the world. You can contact me directly or contact our customer service department and we will take care of you.

    As for the other issues such as calories, cadence, time-stamp, etc., our software engineering team is working day and night to fix these issues. We have next version beta of the firmware and app in Test Flight and early testing looks very promising. We hope to have updates released to solve these issues in the next week. Also, the Android app is progressing and will be released soon in a Lite version to allow some functionality while we finish the complete full-featured version for release in August.

    Again, I will offer our sincerest apologies for the hiccups in this product launch, and offer my appreciation to the users on this forum for all of your constructive feedback that helps make this a better product for all of us. Feel free to contact me directly for any other feedback or questions.


    • I’m grateful for the clear explanation and customer service approach ya’ll are taking. And grateful for DCR as a forum for all of this.

    • Chris S.

      Thanks Steve. I’m looking forward to the fixing of the time stamp sync issue. Otherwise I’m happy with the performance of my Rhythm 24 as an HRM connecting to my Garmin FR 935…just not yet useful in the water. Better days ahead!

    • Andrew

      Thanks for the explanation Steve, it is most appreciated. Hopefully all will be sorted by August when the full Android app is released.

    • Jaques

      Thank you for the detailed explanation. Many other companies will not do this.

    • Dom

      Thanks for this. I was moving away from buying one of these to replace my lost Rhythm+, and your explanation and honesty here make it much more likely that I will now do so.

    • Dan

      Thanks for the response Steve. Is the swim hr supposed to work with Garmin? The store and forward aspect… Mine doesn’t with my Fenix Chronos and it sounds like others are having the same issue.

    • Joe

      Thanks for the update. It sounds like Scosche is committed to making things right for us, which I appreciate as a consumer.
      Are you guys able to tell the range of serial numbers that would have been in that first shipment to Clever Training? As I am an Android user, and bought the Rhythym24 primarily to cache HR data during my swims, I have not really been able to use it yet, but I would like to know if I should consider getting a replacement now while you’re still working out the firmware bugs and Android app.

    • EM

      +1 on the thanks. Clarity on the 2 distinct manufacturing problems is helpful. Knowing what you did to QC the units that you already shipped to retailers gives me confidence to buy. Let us know if there is something customers can look for to identify a unit that may be susceptible to cracking (I assume the weld weakness is not visible when it is there). I will do a little stress testing (not “breakage” testing) when the unit arrives.

    • Dan

      Also, running cadence is incorrect. Ended up with an average cadence of 20 during my 5k today. Also no training effect data or calories. Had scosche set to running with my Fenix chronos.

      link to connect.garmin.com

    • Nathan

      the TE issue is ultimately what will keep me away from the Scosche. I think Garmin might be in part to blame there, but with the Rythm 24, you might be missing out on some of the advanced metrics that you paid so much to Garmin to get in the first place!

    • David

      Thanks Steve, I really appreciate the update. My R24 is holding up nicely and I look forward to the software updates.

    • Barry D

      I am in the same boat and would like to know too.

      I assumed the app would also run on iPad as the Wahoo gear does or at worst I could use the buttons and push data to Garmin 920xt or Training Peaks. As a result I am waiting on an Android app to hopefully run things on my wife’s tablet.

      As a result I have only been using the monitor like the Rhythm+ too, so none of the new features. Hearing that there are potential issues with the Clever Training batch has me worried that later I’ll have issues and it won’t be covered or during a time I would like to have it.

    • Mike

      Bought item in middle of July from clever training and casing broke after 3 runs. Not convinced that problem has been sorted out. Poor design that needs more than simply overtightend bolts?

  129. MattH

    Thanks Steve for the detailed explanation.

    I’m one of the lucky ones, my Rhythm 24 hasn’t cracked, and aside from the time stamp issue for swimming i am very happy with it so far.

    So please keep up the good work informing us all and fixing the firmware. I’m confident you’ve got a great product here once you solve these teething problems.

    Ray, I’m intrigued that you’ve held off publishing your in depth review, despite your normal schedule of publishing once units are shipping. Is this because you are giving Scosche some time to fix the manufacturing and firmware issues discussed above?

    • When they delayed shipping, it delayed my plans there a bit and they moved from a good spot in terms of my ‘publishing schedule’, to a less awesome spot. Right now I’m underwater with prep for products being announced near-term, and for Eurobike in a few weeks.

      I’ve been collecting data on all workouts though, so it’s mostly just a matter of me getting through the first part of this week on a few other products and then hoping to squeeze it in later this week or maybe next week.

      The manufacturing issues I would have waited for if they held up shipping resumption (since they had pulled all units and stopping shipping briefly), but I won’t hold up for firmware issues. My general line in the sand is once a company starts shipping, it’s fair game. At that point they enter in the general queue of products for review, which is roughly categorized on embargo/announce dates and then overall interest in a product.

      Said differently: I need 48 hours in a day.

  130. Steven

    I just got my Rhythm 24 from Amazon. I am using it together with a Garmin Vivoactive HR+

    1) Are the units coming from Amazon free of the manufacturing defect?
    2) Am I correct to assume that this unit will also experience the same calories calculation issue since this is a firmware or software issue?
    3) I want to record 24 hour heart rate data that I can export from Scosche to Garmin. Will I be able to import this heart rate data into Garmin Connect? Will it conflict with the data recorded by the wrist HRM on the Garmin?
    4) While recording 24 hour HR on the R24, I want to also receive HR data from the R24 to the Garmin while recording activities in the Garmin. Will the R24 send data to the Garmin while it is also itself recording HR?

    Thank you.

    • ChrisM

      Same questions as I bought from the same vendor.

      I don’t use HR in the pool, just bike and run, so the only issue (I think) i’m having is incorrect calories on the 920 for the run. However the calories were (or appeared to be) accurate on the edge 520 for cycling.

    • Steven

      Well I have worked out and experimented with my new Amazon purchased R24 and I can report the following:

      1) Lots of dropouts regardless of where I place the monitor on my arm. Yes I waited for the unit to start picking up the HR first.
      2) Can confirm that the HR reported by the R24 does not come even close to the HR that is registering in my Garmin Vivoactive HR. When I do treadmill sprints my HR gets between 170-180. The R24 was flashing red (zone 4-5) but my Garmin was registering 110-120.
      3) I was able to record to my Garmin while the R24 was simultaneously recording HR to its internal memory.
      4) The app is clunky for managing files. Among other things, it quits often while downloading files.

      Way disappointed. I guess I will hope there is a bug fix soon before the Amazon return period expires. I got this to replace my chest strap which does not work well for the many irregular activities that I do…animal flow, planking, burpees. Hard to believe that they could go from a rock solid unit to something that basically just doesn’t work.

    • ChrisM

      I have used it for a 6 hour bike, and :30 and 2:20 run. The hr displayed actually is fine. Wore on the forearm and picked up well. Only dropout was when I rotated it so the sensor was on the outside. Didn’t work. It’s only the calorie calculation I saw was off. I only use it for Hr function, nothing else so other than calories it works for me (and calories I can estimate as needed) and don’t use the app. Expensive but I needed more than 8 hours

    • Steven

      Also if you were thinking, as I was, that you could use this to record all day HR data to the device, think again. I got about 6 hrs recording before the memory was almost full. And battery was down to one LED. So you are not going to record 24 hours continuous data from either a storage or battery life perspective.

    • Chris Menjou

      Well, that would suck as it’s the only reason I bought one. Granted, I haven’t read the full review, but I don’t care about memory recording, just current heart rate. Is there a way to turn off the memory/recording?

    • Brian

      Memory recording is a special use case. You push & hold the small button to initiate, and it starts recording and saving. This mode is independent of any other device. Otherwise, it normally behaves like every other type of real-time HR monitor.

    • chris


  131. Gordon Goodtimes

    I’m really surprised by folks’ concerns with the calories. I didn’t realize this was something folks widely used/relied on. I guess I’ve always just figured it was an estimation, and not ever something I really worked from. Shows what I know

    • Nathan

      I think the calorie calculation and training load stuff probably go hand in hand. Calories is not something i care a great deal about, but training load and the metrics that are derived from that are important. I’ve seen training load oddness on the Scosche rhythm+, and i’m sad to see this is still an issue.

    • David

      Maybe it’s me but I use my Apple Watch (and for a long time before my Garmin’s including a Fenix 5S) to estimate my 24/7 calorie burn including workouts and then have the watch integrate that number with popular food trackers such as MyFitnessPal or LoseIt to give me a estimation of calories IN vs. calories OUT which for me at least seem fairly accurate with what I see on the scale. Because I’m using an Apple Watch with the R24 (using bluetooth) I don’t have an issue with calories but if I still had my Fenix 5S this would be an instant deal breaker.

      I’m sure a lot of great people work at Scosche and have worked hard on this product but I’m surprised by the look, delays, build quality issues, software hangups, and seemingly slightly worse accuracy vs. their older model when competitors have released their own models in the interim. I guess I’m naive but I just thought “this shouldn’t be this hard” in 2018.

    • Andrew

      Seems like Scosche released the 24 prematurely in response to competitors also announcing new OHR products?

  132. Peter St.

    Today was not a good day for my R24 as for the first 14 minutes out of nearly 60 it though that my HR was 170+ when in reality it was ~115. Then it somehow adjusted…

    But I’m not really concerned with that. What worries and prevents me from using it as a standalone HR solution for my Garmin 935 is problems with training effect / training load etc. Until they have a score of 0 after training with R24, tis product is not usable for new Garmins (as 645 have the same issue as I can judge from posts in Garmin forum). Unfortunately 🙁

  133. MartinF

    Same issues here with not downloading after a swim and calories/recovery/TE being way off during runs when connected to Garmin 920XT. HR looks good during activities though. Will use the old one Rythm+ until this is fixed. Disappointed for now since we have owned 5 of the old units which were very solid in their performance. Killed two of them after many years of use. Happily replaced them since they worked so well.

  134. Eric

    I tried to update my 24 today from the iOS app, got through the first spinner, and then failed somehow, so now it looks like it’s stuck in some sort of DFU mode (solid green light on front, solid dim green light on back). The app says to let it sit and run out of battery (since it’s not actively checking, i feel like this is going to take forever). Working with support now to figure out what to do.

    • FTB3

      Try putting it on the charger for 15 to 20 seconds, then take it off and see if it resets.

    • Eric

      Support hooked me up with a replacement (they also previously replaced my older Rhythm+ as well, so far great service from them).

    • Eric

      Support had me try this, for 60 seconds, no luck. It’s basically completely unresponsive, buttons won’t work, kind of interesting.

    • Mike

      I have the same problem today 🙁
      I will try to contact with support 🙁 shame i have no monitor for next few trainings 🙁

  135. NOTICE: There is an iOS update for RhythmSync in the App Store that includes a firmware update for your Rhythm24. The update also includes improved help and bug fixes for the app. Firmware updates: timestamp fix, calories adjustment, and other performance improvements.

    Regarding calorie count – some apps are just reporting our calorie data, which is coming directly off of the Valencell module, calculated with their algorithm. However, there are a number of apps and devices out there that are trying to be smart and learn about your individual calories and training efforts, so they are always adjusting as you develop more data from your workouts. We have learned that Garmin is doing this. We adjusted the data that Garmins are receiving, but how they are calculating the final numbers is proprietary. You will get various readings from different devices as they are learning at different rates. But you should see improvement over time.

    We will continue to monitor the performance of this new firmware and listen to your comments and feedback on this forum. Please share your results and observations and we will consider additional adjustments as needed.

    Thanks for your continued support and feedback. You are all helping to make the Rhythm24 a better product.

    • Dan

      Thanks Steve,

      Will the time stamp fix the swimming store and forward aspect for Garmin Watches? It’s the main reason I updated from my old Scosche.

      Appreciate the quick update!

    • Brian

      I did a pool swim this morning, after updating the R24 firmware last night. It still did not cache and forward HR to my Garmin 735XT for the swim.

      Interestingly, and unexpectedly, I did an open water swim Saturday, and that did capture swim HR (cache & forward).

      I did not try to internally capture the workout in the R24 this morning, so I did not get the timestamp file.

    • Zoltan Hubai

      Is there a plan to release Rhythm Sync to Android? I do not have an iPhone but have an iPad but I can’t install it on an iPad is there maybe a plan to enable Rhythm Sync for iPad?

    • Dan

      After update Garmin still reports average running cadence of 22.

    • MattH


      Thanks for keeping us all infomed on updates and the prompt delivery of new app, firmware etc.

      Ive updated my rhythm 24+ and took it for an open water swim yesterday. Setting it to swim mode and started the swim activity as normal, and it recorded the swim ok.

      Can you confirm exactly how the rhythm 24+ is supposed to interact with a GPS watch in swimming mode?

      My experience is that I can get real-time heart rate measurements on my Forerunner 935 (i have one screen set for HR which I can glance at whilst swimming). After completing the swim, my 935 automatically uploaded the activity to garmin connect and then on to strava.

      I manually sync’ed my Rhythm24 with the new app after the swim; then uploaded that to Strava, and exported the FIT file to emai to myself.

      The upload to Strava created duplicate activity to that uploaded from my 935 (with minimal info such as duration, and heart rate zone info). It certainly isn’t merging the rhythm24 data with my 935 upload – is it supposed to?

      From a garmin connect perspective, when i try to manually add the FIT file that I’ve emailed to myself from the rhythm app, it appears to be an invalid FIT file and won’t load into Garmin Connect. Again, is that by design?

      I think there are a few people on this thread who are expecting the rhythm 24 to perform the same as a HRM-TRI strap – so that HR info from the Rhythm will seamlessly merge into their Garmin activity file at the end of the swim. Is that a valid expecation?

      Or should we be content with receiving realtime HR from the Rhythm24 during the swim, and not trying to sync post workout?

    • Using with Garmin FR935

      Hi Steve, I would like to echo and re-post a previously published comment/question:
      “I think there are a few people on this thread who are expecting the rhythm 24 to perform the same as a HRM-TRI strap – so that HR info from the Rhythm will seamlessly merge into their Garmin activity file at the end of the swim. Is that a valid expecation?”

  136. peter den heijer

    Installed the new software, did a swim with recording on, however my fenix935 still fails to upload the hr data afterwards.

    While I had problems with the old rhythm this new rhythm24 tracks my heart rate perfectly


  137. Jiaren

    Sadly, the ANT+ swimming does not work on my Fenix 5. My Fenix won’t register any HR data from Rhythm 24.

  138. Andrew

    Is there are downloadable user manual for the Rhythm24?

  139. Yannick

    Hi guys,

    I too have a cracked unit and seeing the extent of other people description of their problem, I’ll just skip the angry part and post a picture of where my unit broke. In all this, I’d like to command Steve from Scosche for openly participating in this post, and Ray for having a blog that has greatly accelerated the resolution of the issue.

    • EM

      Please let us know where and when you bought the units that crack. I just ordered from Amazon/USA.

    • See above comment from Scosche: link to dcrainmaker.com

      It doesn’t matter where/when you bought it, all those units have been pulled from inventory (and were pulled a while ago).

    • Andrew

      It matters if you want to know if it’s likely to fall off while open water swimming?

    • EM

      I saw the official statement. I want to verify that their belief that there are no more bad units at the retailers is in alignment with what buyers are experiencing. Did Yannick buy an early batch or recently? It will be comforting to hear that Yannick bought from an