• Clever Training

Hands-on: Scosche’s New Rhythm 24 Optical HR Sensor Swiss-Army Knife


I initially thought of just titling this post “Scosche’s New Rhythm 24 Optical HR Band”, but in reality, that doesn’t begin to capture what they’re doing with the new Rhythm 24.  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 Rhythm 24.  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 LED’s 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 Rhythm 24, 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 Rhythm 24 is now their latest gen.  They noted that “since then we’ve upgraded the MCU for lower power consumption, upgraded the LED’s in the sensor, made countless improvements to the signal processing algorithms, and made the firmware field upgradable for future enhancements”.


Previously though that limited them to about 6-10 hours of battery life, whereas now with the Rhythm 24 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 LED’s 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 Rhythm 24 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 Rhythm 24.

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 LED’s 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 Rhythm 24 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 Rhythm 24 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 Rhythm 24: 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 Rhythm 24, 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!

Product Comparison:


I’ve added the Scosche Rhythm 24 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 January 9th, 2018 @ 11:44 amNew 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+10 hours30 hours
Battery TypeUSB rechargeableUSB RechargeableUSB rechargeable
NFC CapableYesNoNo
HR TransmissionScosche Rhythm 24Polar OH1Wahoo TICKR FIT
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 w/o 2nd deviceYesYesNo
Additional DataScosche Rhythm 24Polar OH1Wahoo TICKR FIT
Run PaceYesNoNo
Run CadenceYEsNoNo
Run Economy/MetricsNoNoNo
Cycling Power Meter EstimationNoNoNo
Valid HRV/RR dataAt rest onlyNoNo
Configurable Sport ModesYesNoNo
Requires Bluetooth Smart Phone for ConfigurationNoNoNo
Firmware UpdateableYesYesYes
Amazon LinkN/ALinkLink
Clever Training Link (Save 10% with DCR10BTF)LinkLinkLink
Clever Training Europe (Save 10% with DCR10BTF)N/ALinkN/A
More InfoLinkLink

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 Rhythm 24 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…).

Thanks for reading!

Note: You can now pre-order the Scosche Rhythm 24, which is currently slated to deliver in late April.  If you order via Clever Training, then you’ll not only save 10% using DCR Coupon Code DCR10BTF, but also get free US shipping, and it helps support the site here – I appreciate it!

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  1. Chris

    want to have it and send my old Rhythm strap to sleep :D

  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.

    • 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.

  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?

  7. 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

    • 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.

  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?

  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?

  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. :D

    • Wendy

      In the irony of timing, my roomba just ate the power cord for my Scosche :D 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 8-)

  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.

  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.

  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

  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?


  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?