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Quarq DZero Power Meter In-Depth Review

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This past summer at Eurobike, Quarq announced their latest generation of power meters, the DZero lineup.  The aim of this line was to refresh the existing offerings, while also somewhat simplifying things.  Most visible to consumers though was the addition of Bluetooth Smart transmission, making for dual ANT+/Bluetooth Smart capabilities.  Alongside that was an updated multi-color LED for status clarity.  Behind the scenes, the company tweaked the strain gauge design to increase accuracy levels.  Finally, the company also added support for Boost 148 and BB386 EVO bottom bracket compatibility.  Phew.

I’ve been riding a DZero loaner unit that Quarq sent to try since December.  Plenty of indoor and outdoor rides across all sorts of lovely winter (and now spring) conditions.  In doing so, I’ve been recording boatloads of test data, with usually 2-3 other power meters on the bike at the same time.  Like normal, I’ll be sending the unit back to Quarq once I’ve wrapped up the review.

With that – let’s dig into what’s in the box and then get it setup on the bike.

Unboxing:

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The exact configuration of your Quarq DZero box will vary based on what exactly you ordered. In my case, the loaner unit I got came with chainrings pre-installed, minimizing the amount of work involved in setup. I like that…because I’m lazy.  Though realistically installing chainrings is just a couple minute task at worst, it takes only a hex wrench.

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As noted, my unit came with the chainrings pre-installed, but they also included some extra chainrings for craps and giggles.  Further, they included a bottom bracket adapter, simply because the bike I was installing it on didn’t match the bottom bracket of the unit.

Otherwise, inside the box, you’ll find a small packet of papers that serves as a guide and warranty cards.  And then, of course, you’ll find both the drive-side (with chainrings) and non-drive side crank arms situated.

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And a closer look at the informational pieces of former trees:

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If you take a peek at the piece of paper rubber-banded to your crank arm, it’ll show the test information from the factory calibration test pass.  It’s actually pretty cool how that all works, and I showed it within my behind-the-scenes post at Quarq’s HQ last year or so.

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Here’s how the two look when positioned all pretty:

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And thus concludes our unboxing section.  I love unboxing sections that have a mere two parts to the device.  Note the coin cell battery is already pre-installed.

Installation/Configuration:

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Like any power meter, getting the Quarq installed will vary depending on what your current bottom bracket setup is relative to whatever you bought from Quarq.  If you were smart, you bought the same bottom bracket setup, and thus your installation is pretty quick and easy.  If instead you elected to introduce unnecessary pain and confusion, then you bought some other standard and now need to also convert your bottom bracket.  That, in turn, may be easy, or you could spend all day waiting for glue to dry.

In this case, I kept things relatively simple and thus the change was easy enough.  Since I was using GXP previously, I merely needed to remove a few screws and pull out the existing crank set.

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Then, I slid in the new crank set.  Don’t forget to put the chain on the correct side of the axle, else, you’ll swear a bunch when you get to the end and realize you have to start over again.  Don’t worry, I forget about 73% of the time.

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Once done you’ll go ahead and screw on the non-drive crank arm on the other side and then attach your pedals.  Don’t forget spacers if your pedals require them.

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Of course, just like bottom bracket changes can vary, so can how you buy the Quarq when it comes to chainrings.  If you bought just the power meter spider, then you’ll need to install the chainrings (those are the spikey things that you can use like a Frisbee if fending off a knife attack).  Whereas if you buy the whole kit with them pre-installed, then you’ll save yourself 5-15 minutes of time.  It’s super easy to install chainrings though.

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Once everything is set, toss your bike on a trainer and do a few brief (like 5-20 second) hard efforts to ensure that:

A) The front doesn’t fall off, and…
B) It doesn’t sound like anyone is dying down there.

If both things check out, then we can move onto doing a zero offset.  Which I might as well cover in the ‘general use’ section.  Beyond that, we’re done here.

General Use Overview:

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As has been the case for about a decade, using a Quarq power meter is pretty darn simple.  You can more or less set it and forget it.  Yet there remains a fair about of tweaking that can occur behind the scenes with their apps, for advanced users that want it.  In fact, I’d argue no power meter has as much tweakable potential.  On the flip side…it’s generally best not to tweak things unless you really truly know what you’re doing.

First though, let’s start with the basics.  And no better place to begin than the battery compartment. The unit hosts a CR2032 battery, like many ANT+ sensors these days.  Quarq states a battery life of about 200 hours, though I haven’t ridden enough hours yet on it to find the end of that tunnel.  Generally speaking, their battery life estimates are pretty solid.  Not to mention that Quarq says that realistically folks can probably get up to 300 hours in the right conditions, but that they went with a more conservative 200 hours for those that might be riding in battery-challenging conditions like the Arctic Circle in December.

The battery compartment can be found right on the front, easily unscrewed and accessed without any tools.  Long-time Quarq users (and Quarq themselves) know that much older generations of Quarq units (i.e. those before around 2012 or so) had a bunch of challenges with battery caps and water ingest.  But since then things have been pleasantly quiet.

The battery is found under that little ‘Q’ cap-looking thing:

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We’ll move onto connectivity, for which the DZero supports both ANT+ and Bluetooth Smart.  This means you can use any head unit that supports ANT+ power meters like a Garmin or Wahoo device, as well as those from Polar and Suunto that support Bluetooth Smart power meters.  I’ve tested it across virtually all Garmin devices made in the last few years (via ANT+), as well as via Bluetooth Smart on the Garmin Fenix 5 and FR935, Polar M460, Wahoo Bolt, and even Zwift iOS.  No issues.

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When it comes to the data types the DZero supports, it will depend on which protocol you use:

ANT+ Power (total)
ANT+ Power Balance (estimated)
ANT+ Cadence
Bluetooth Smart Power
Bluetooth Smart Power Balance (estimated)
Bluetooth Smart Cadence

Since the unit isn’t a separated left/right power meter (i.e. like a PowerTap P1 or 4iiii Precision), it tends to handle 3rd party compatibility over Bluetooth Smart better than those that are dual systems on Bluetooth Smart.  On ANT+ there are no issues at all with either type.  Pro Tip: If reading this review some time down the road and you want to validate compatibility with your specific head unit over Bluetooth Smart, double-check the comments section below.  Many folks will chime in to confirm operation. For example, you can see the Polar M460 connecting to the Quarq DZero below:

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As for the metrics noted above, you can see this detail on the head unit itself of course, or afterwards on various platforms depending on the capabilities of the platform.  For example using the baseline of Garmin Connect, here’s what you’ve got for a ride.  Whereas if you pair to Suunto’s platform you won’t get some of the additional power meter metrics beyond baseline power, since Suunto doesn’t support those.  Meanwhile, Polar sits somewhere in the middle on support of advanced metrics.

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When it comes to pairing your head unit, it’ll show either an ANT+ ID or Bluetooth Smart name.  In the case of ANT+, for example, the ANT+ ID is actually the last five digits as listed on the power meter itself (seen below).  Whereas in Bluetooth Smart it’ll list Quarq DZERO in the results, as well as a unique Bluetooth ID (like seen above in the Polar M460).

Most head units support re-naming the sensor ID to something more friendly so you can remember/find it later.  In the case below I’ve renamed it to simply ‘Quarq’.

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One of the most important things to do is regularly check your zero offset, which is a form of calibration.  Technically there are more detailed calibration levels, but for 98% of consumers out there, the zero offset is as close as they’ll get.  This allows you to monitor a given value and see if there are major changes to it.  Generally speaking, that number will shift slightly with temperature, but in rare cases it can also change dramatically if something has gone wrong with the unit.

In the case of Quarq, there is no ‘right’ number, but rather you’re looking to see minor shifts each time (a few digits) at most.  If you see a major shift and you haven’t moved your bike to Antarctica, then I’d ring up Quarq service.

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With a Quarq DZero unit the company does their 10K temperature compensation for each unit that leaves the factory, which means they record how the unit responds to a massive temperature range, ensuring higher levels of accuracy at any cycleable temperature level.  I detail how that works in my behind the scenes post at their factory.

Still, I find it a good practice to do a zero offset (which is technically what you’re doing) before I start each ride after taking the bike outdoors.  Or indoors too.  This just lets me mentally validate all is happy.  To do so on the Quarq you’ll simply remove your feet from the pedals and then use your head unit to perform a ‘calibrate’ or ‘zero offset’ (wording will vary based on head unit).

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It’ll come back with the aforementioned value a few seconds later.

One can also do the same on the mobile app too if you’d like.  Which makes for a perfect time to talk about said app.

With Bluetooth Smart being added to the platform, it means the company has tweaked their Qalvin app to connect over Bluetooth Smart (BLE) for configuration tweaks to the DZero.  This is where you can also update firmware.  The DZero app is free on iOS and Android.

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Within the app you can check status of the power meter, as well as tweak some settings and calibration related parameters.  It’s both silly easy to use and fairly powerful.  And of course, you can update the firmware too.

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With that, we’ve covered pretty much all you need to know about using the unit.  So, let’s shift into whether or not the thing is accurate.  In many ways, that’s more important than above anything in this section.

Power Meter Accuracy Results:

I’ve long said that if your power meter isn’t accurate, then there’s no point in spending money on one.  Strava can give you estimated power that’s ‘close enough’ for free, so if you’re gonna spend money on something it shouldn’t be a random number generator.  Yet there are certain scenarios/products where a power meter may be less accurate than others, or perhaps it’s got known edge cases that don’t work.  Neither product type is bad – but you just need to know what those use/edge cases are and whether it fits your budget or requirements.

As always, I set out to find that out.  In power meters today one of the biggest challenges is outdoor conditions.  Generally speaking, indoor conditions are pretty easy to handle, but I still start there nonetheless.  It allows me to dig into areas like low and high cadence, as well as just how clean numbers are at steady-state power outputs.  Whereas outdoors allows me to look into water ingest concerns, temperature and humidity variations, and the all important road surface aspects (i.e. vibrations).

In my testing, I generally use between 2-4 other power meters on the bike at once.  I find this is the best way to validate power meters in real-world conditions.  In the case of most of these tests I was using the following other units concurrently:

PowerTap G3 hub based power meter
PowerTap P1 pedals based power meter
Stages Gen2 left-only unit
Tacx NEO Trainer
Wahoo KICKR2 Trainer

In general, my use of other products is most often tied to other things I’m testing.  Also, when it comes to data collection I use a blend of the NPE WASP data collection devices, a fleet of Garmin head units (mostly Edge 520/820/1000 units) and some Wahoo ELEMNT BOLT units.

Note, all of the data can be found in the links next to each review.  Also, at the end is a short table with the data used in this review.  I’ll likely add in other data not in this review over time as usual.

With that, let’s get started on an indoor trainer ride, which is always a great place to start.  In this case it was a ride where the Tacx Neo trainer was controlled via FE-C from a head unit.  I was simply setting specific wattage values via the head unit.  This is a great and simple test to ensure that there isn’t any obvious drift between the products over time.  Here’s the Analyzer link that these graphs come from for that ride.

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(Above the data is smoothed at 5s, and the purple lines you see earlier on were some sort of ANT+ dropout on the P1 units. I moved the head unit and it resolved it.)

Above you can see that up until the 36-minute marker the three units stay fairly darn close.  Within a few watts in most cases, with the Tacx Neo generally being the lowest (as it should be considering drivetrain loses), and the P1 and DZero units blended together.

One odd area though is between the 35 and 43-minute markers, when I increase the cadence slightly to about 115rpm (which isn’t all that high in the grand scheme of things).  All three units ‘separate’ and report different values.  Unfortunately, this is one of those rare scenarios where I can’t establish a clear ‘winner’ in this case, since none are the same.

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After that high cadence section all three units merge back together again, so it definitely is a bit peculiar, and not something I saw in subsequent tests.  It’s plausible given this is older data that it was on the earlier firmware version, but I’m pretty sure I updated firmware back in the early February timeframe.

Let’s shift then to another indoor trainer ride, this time on Zwift. Zwift is interesting for the variability within power, and the fact that it forces numerous units to react more quickly than a simple ERG mode.  Here’s that workout file.

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In the above charts, the power data is smoothed at 5s to make it easier to see.  Overall you can see things match quite nicely.  Even those sprints which close in on 700w+ match up very well.  And keep in mind that’s actually higher than that, because of the smoothing factor.

If I zoom in on the lesser sprint at 33 minutes, you can see all three units react rather beautifully:

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I would have expected the P1 and DZero to be a bit closer here, though not much. If you use a +/-2% accuracy range, that means you’re looking at each one having a swing of +/- 12w on 600w.  So a total swing potential of 24w on 600w between the two units – and we’re within that envelope (and especially once we include slight differences in measurement locations).

And again the same at the 13-minute marker with all being inside the accuracy envelope.

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Even if reduce the smoothing to 2s we can see all three units match quite well on that final sprint.  Keep in mind that, due to slight differences in the way different types of power meters transmits and head units record data, it’s virtually impossible to get the same 1-second value for max power between units (plus, they vary in recording location anyway).

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That said, spitting out a mean-max graph for these, you’ll see that even the upper peak 1-second max recorded value is pretty close.  The remainder of the units track evenly across the entire duration, albeit at perhaps a few watts more separation than I’d like.  Nothing out of spec, but ideally they would have been just a couple of watts closer.

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Finally, let’s shift gears and head outside.  It’s more fun out there anyway.  This nearly three hour ride covers plenty of terrain, including cobbles and other rough roads.  Plus of course nice smooth roads as well as plenty of stop and go moments.  As you can see, it’s a bit of a mess to look at from the three-hour view:

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Though what’s important here is that there’s almost no separation between the three units.

So let’s zoom in on a few sections to dive into in more detail.  First I’m going to pick a section which is largely steady-state at about the 1hr marker:

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The data above in this little 7 or so minute section is rather clean.  All three units track quite nicely, and the ‘ordering’ is correct with the PowerTap G3 hub being the lowest, then the Quarq DZero, and finally the PowerTap P1 being highest. Despite some solid 500w surges (the above data is smoothed at 10 seconds), it still looks pretty.  Below, I put the smoothing at 3s and the numbers are still very close:

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Picking out another point, here’s a 900w sprint, at 0-seconds of smoothing.  Again remember that you’ll virtually never see a perfect match in these max effort type scenarios.  Interestingly, you can see the slight oddity in the PowerTap G3 hub for about 1-2 seconds at the base where I briefly slowed my cadence.  The G3 misses that (it often does) whereas the Quarq and P1 pick that up.

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Speaking of cadence, as many know, Quarq shifted from a magnet-based requirement a few years back and has been since allowing you to run magnet free.  In digging through a fair bit of data I’m not seeing any issues here either with respect to cadence variability.  Here’s a random snippet of cadence out on the road.

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Last but not least, to wrap things up we’ve got a mean-max chart for the three hour ride:

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The units are pretty much glued together throughout the ride, minus a very slight bit of difference at the peak 1-minute to 2-minute power.  Though, it’s pretty minor differences with mostly the G3 hub that differs there (and is within accuracy range spec).

Overall I don’t see anything of concern here.  While Quarq did have an issue back in early January impacting accuracy for some people in certain high-wattage sprint situations, that isn’t something I saw with the firmware update released in late January intended to address it.  It’s also possible my paltry sub-1000w efforts simply couldn’t trigger said bug (that again, they and other users have said has been resolved).  For everything else, the power numbers and accuracy figures I see are in-line with other units that are generally known to be trusted and respected within the industry.

Finally, here’s a table of all of the comparative data that I’ve used in this review, along with others I didn’t show in this review.  Further, there are additional days where I just didn’t capture 2-3 other power meters concurrently, but may only capture one additional power meter.  So I didn’t include those in here.

Quarq DZero Power Comparison Data

Workout DateDCR Analyzer LinkProducts Used In Test
March 30thAnalyzeQuarq DZero, PowerTap P1 Pedals, Stages Gen2, Tacx Neo, Xert
March 26thAnalyzeQuarq DZero, PowerTap P1 Pedals, PowerTap G3 Hub
March 24thAnalyzeQuarq DZero, PowerTap P1 Pedals, Tacx Neo, Zwift
March 5thAnalyzeQuarq DZero, PowerTap P1 Pedals, Tacx Neo, Xert
Feb 17thAnalyzeQuarq DZero, PowerTap P1 Pedals, Tacx Neo, FE-C Manual Control
Feb 6thAnalyzeQuarq DZero, PowerTap P1 Pedals, Tacx Neo, Zwift
Dec 28thAnalyzeQuarq DZero, PowerTap P1 Pedals, Kinetic SmartControl, Kinetic Fit App

You can click on any of the links above and also select to ‘Download Set’, which lets you download all of the original .FIT files from the various devices used to record the data.  All of the data is shown using the DCR Analyzer.

Power Meter Recommendations:

With so many power meters on the market, your choices have expanded greatly in the last few years.  So great in fact that I’ve written up an entire post dedicated to power meter selection: The Annual Power Meters Buyer’s Guide.

The above-noted guide covers every model of power meter on the market (and upcoming) and gives you recommendations for whether a given unit is appropriate for you.  There is no ‘best’ power meter.  There’s simply the most appropriate power meter for your situation.  If you have only one type of bike I’d recommend one power meter versus another.  Or if you have different needs for swapping bikes I’d recommend one unit versus another.  Or if you have a specific budget or crankset compatibility, it’d influence the answers.

Now since the guide came out this past fall, there really hasn’t been any major entrants in the market that weren’t already covered in that post.  However, there have been two noteworthy reviews since, plus one coming up shortly:

A) 4iiii Precision Dual Review: The post in my annual power meter guide didn’t cover the accuracy aspects of the newer left/right setup, so I didn’t dive into general recommendations.  But as you saw in my Precision in-depth review a month or two ago, that’s solid. No issues recommending it, works well.

B) WatTeam Gen2 Dual: You also saw in that review a month or so ago, and it was mostly pretty good.  The WatTeam re-introduced their $499USD dual left/right power meter this past winter. There were two quirks that I saw though, so you’ll want to check out that review to see if those impact you.

C) ROTOR 2INPower: This is their dual left/right setup that they announced last year and started shipping in the fall-ish.  I’ve completed all data gathering on it, and all photos on it.  Early glance at the data shows it looking very good, but I haven’t dug into all the files yet.  Either way, review up next week!

But again – check out the power meter recommendations guide here. I typically do this in September, and I didn’t see any notable power meter announcements at Sea Otter last week (where we sometimes see power meters announced), thus I’ll likely hold off on doing another annual summary until September as well.  Especially since the word ‘annual’ implies once a year. 😉

Summary:

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It’s probably not much of a surprise that Quarq would deliver a solid unit, that’s generally what they’re known for.  Still, it’s important to validate that assumption and ensure it holds true.  And in the case of the newly added Bluetooth Smart compatibility, it’s important to ensure it works on leading units out there via Bluetooth Smart.  I’ve checked it on the Wahoo BOLT, Polar M460, and Fenix 5 (via Bluetooth Smart).  Plus, of course, boatloads of others via ANT+ without issue.

For those power users (in the data geekiness way), the extra validation and config options that Quarq offers via their smartphone app will likely continue to be appreciated.  After all, they were the first one to introduce those options many years ago.  At the time it enabled bike shops and others to quickly validate configurations and settings.  These days it allows consumers to validate those same settings and check for firmware easily.

I’d have zero issues recommending the DZero to anyone, it just works, and works dependably every time with virtually no fiddling.

Found this review useful?  Or just wanna save 10%?  Read on!

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.

I’ve partnered with Clever Training to offer all DC Rainmaker readers an exclusive 10% discount across the board on all products (except clearance items).  You can pick up the Quarq DZero from Clever Training. Then receive 10% off of everything in your cart by adding code DCR10BTF at checkout.  By doing so, you not only support the site (and all the work I do here) – but you also get a sweet discount. And, since this item is more than $49, you get free US shipping as well.

Quarq DZero Power Meter (various models)

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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186 Comments

  1. Tim Grose

    So no issues picking up a signal on a watch on your wrist while out on aero bars?

    • In this case, I was testing on a road bike. Though, it’s virtually unheard of to hear of folks having aerobar related watch placement issues with Quarq units.

    • Hi Tim. The development process for new power meters has time dedicated to radio signal strength. (The bump you see on the DZero cover plate is making room for a great antenna. It’s not just a spot for a logo.) Our testing process includes both lab and field testing for radio signal strength. Field testing is a sight to behold! We use a Cervelo P2 equipped with a power meter and a rear rack holding a small laptop. Then there are wired receivers on the stem, base bar and aero bar extensions and even a receiver on a velcro strap being worn on the rider’s wrist. Finally, every Quarq power meter is tested for radio signal strength before it leaves the factory.

    • Daniel

      Troy I believe this statement holds true now “Pics, or it didn’t happen”. That sounds like an amazing testing rig.

    • Ben

      Hi Troy, I just has my DZero installed and went for my first ride on Saturday. I had power dropouts every 5 mins or so, lasting 20s to 2 min, between the unit and my Garmin fenix 5 mounted on aerobars. Running latest firmware (non beta) on both devices. Anything I can do?

    • Hi Ben. This is abnormal behavior. Please email Quarq customer service on thinkfast@quarq.com. You can call them too. link to quarq.com They will be able to help.

  2. Anonymous Coward

    “unless I see any major changes at Sea Otter later this week” — didn’t this already happen? :)

    Also: what’s up with Quarq for Cannondale / Specialized? Stuck on the old platform with no DZero ETA still? SOL?

  3. Eric O

    Wheat Ridge Cyclery in Denver installed the SRAM Red eTap version of the DZero on my bike on October 4th last year. It must truly have been Serial Number 1 or 10 or something like that. Regardless, I have had Zero issues, problems or complaints with it. As Ray said, “it just works” and has continued to do so. We’ll see if that holds now that spring is coming to the Rocky Mountains…

  4. Husain

    Does the length of the crank arms affect measurement accuracy? Especially if I swap it out with a shorter version (aftermarket).
    Thanks Ray.

  5. Robin

    Appreciate the “Front fell off” clip with the great Kiwi comedian, John Clarke (link to en.wikipedia.org), recently deceased. Very funny man, and clip.

  6. Dane Newman

    Do you notice that the battery power level in thew quarq app is stuck at 85%? My quarq dzero power meter never changes from 85%

    • Rab Austen

      Yes, mine also sits at 85%. Regardless of whether it is a new battery or one I’ve run for 100+ hours.

      Saying that, the unit has been super solid. It arrived with firmware v1 on it so i did get one glitch on a very cold day, riding single track. Updated to v3 and it’s never missed a beat.

      I use mine with a Garmin Edge 520 and Trainerroad via my phone app. 5 stars from me.

    • Chris

      Mine also is at 85% since I have it. Quarq support told me this is a referenced bug…
      The other problem I have is that power balance is not displayed on my Polar V800.

    • Ha, me too. Will keep an eye on it now. Thanks for the heads up.

    • To clarify, the ‘me too’ was with regard to the battery level

    • Yup, me too (as seen in the screenshots) – nice catch! I guess it’s eternally optimistic. :)

      I’m sure if the Quarq folks didn’t know before…they certainly do now. Historically they’ve also responded here too, so I suspect we’ll see them make a comment on it.

    • Quarq’s digital wrench, Qalvin, displayed battery volts when it used ANT+. When we moved to Bluetooth Low Energy (BLE) we changed to a battery life percentage. BLE has a standard to represent battery life that goes from 0-100. You typically see 85% because power meter batteries sit around 2.9 volts for most of the power meter’s life.

    • Doug

      so this is essentially a piece of useless information? it makes it seem like you have 85% of the battery life left. Is this something that will be updated in future to actually reflect how much battery you have left so you know when you replace it?

    • Hi Doug. Yes, displaying battery voltage is in our to-do list for Qalvin. Unfortunately I cannot give you an ETA. Bluetooth head units will, however, continue to use 0-100 — until the Bluetooth specification changes.

  7. Paul Appleyard

    My Elsa R Fell off last week! The bolt keeps on loosening off I was lucky i was only 4 miles from a bikeshop who kindly fixed it for me.

  8. chup

    The link of below is not working.
    MARCH 30TH QUARQ DZERO, POWERTAP P1 PEDALS, STAGES GEN2, TACX NEO, XERT

  9. SeanU

    Is there any crank-based powermeter that I can use out of the box with my original Shimano pressfit bottom bracket???? ( which is what 90% of the riders have installed)

    • Michal

      Theoretically you can try fitting crank based power meter with FSA Megaexo spindle (Gossamer power2max Type S). But it might be very tight fit and honestly I wouldn’t use hammer on my power meter crank spider. There are also adapters for fitting GXP spindle (Quarq) to Shimano BB. Those are just workarounds though. I would just use proper BB (as I did, by replacing Shimano press fit with GXP pressfit).

    • Fernando

      Anything with a Rotor 3D crankset would work (not the 3D+!). Like the Rotor power meters or the Power2Max ones

    • SeanU

      Thx for the answers – still unsatisfying though.

    • J Ward

      Pioneer, any of the stages that use Shimano cranks, SRM – anything that uses a shimano crank.

  10. Ole Kronkjær

    Which DZero version should I buy for my Shimano Dura-Ace Di2 (On Canyon CF SLX 2016 model)

    • chup

      DZero or DFour spindle should be GXP as it is compatible with BB86 frameset when the Pressfit GXP BB is installed.

  11. Brett

    Looking forward to the 2IN review next week Ray

    I’ve had one of their original Dual ones that got replaced with just an IN Power under warranty. I know you also had issues with the original, so hopefully we’ll see what you think

    • Tim Grose

      That’s interesting – I have got the original and although it “works”, I have signal range issues to a watch when out on the aero bars (hence my earlier question). Did your one stop working altogether?

    • Robert

      I just hope Ray shows a video of the soft pulsing light that comes from the 2Inpower when you attach the magnetic charge cord. That’s my favorite feature.

    • I don’t think I took any video of it unfortunately (travelling at the moment)…though, it is rather pleasant. :)

    • Simon Polstra

      Also waiting for the 2inpower review before I buy one, because I want to be sure there are no ANT range issues with a sport watch like the fenix 5s.

  12. Adam

    I have been using the Quarq DZero solidly for 5 months now and I’ve found that whilst it CAN produce good data, my unit has been suffering from an intermittent issue whereby the cadence and power values become very erratic for weeks at a time. Did you not experience any of these issues in your testing?

    I contacted Quarq Support and eventually they acknowledged that it’s a possible bug in the firmware, a separate issue to the one addressed in the v3 firmware that you mention. I posted a thread up about it on Slowtwitch (link below) and thought it might be worth mentioning in case anyone else is suffering from it, thinking that they have a dodgy unit.

    Hopefully a fix is on the way, because I love it when it’s behaving well and producing good data, but for the numerous workouts where the values are all over the place, I have to ramp the smoothing-interval of the power data right up to make any sense of it.

    link to forum.slowtwitch.com

    • Chup

      Got my Red DZero for a month without issue. I did upgrade to v3 before I start using it from day 1.

    • No, definitely didn’t see anything like that. I’ve taken note of it though and will see what Quarq says.

    • Hi Adam and others. I will give you some background then dive into what’s happening now.

      Quarq’s accelerometer cadence was designed so that a cadence discrepancy in any single pedal stroke would be adjusted in the next pedal stroke. Therefore cumulative accuracy is unaffected and there is little or no impact on cumulative power values such as kilojoules, average power and normalized power. In objective terms, single pedal stroke accuracy in the worst conditions varies from magnet-based cadence by a maximum of 2%. And benchmark tests showed the accuracy of Quarq’s accelerometer cadence matched or surpassed other products that use accelerometers. We shared this information on the Quarq website’s FAQ for many years.

      With DZero we received reports and saw ourselves that cadence would sometimes bounce up and down on head units around a steady/single value. Thanks to great input (and patience) from customers and sound work by our engineers we have removed the bouncing from the display but also improved the sampling rate and further refined accelerometer readings such that DZero now matches the accuracy of magnet-based cadence. This is something we are very proud of!

      We expect to release a new version of DZero firmware that includes this updated in the next 7-10 days. It’s going through the final stages of testing now.

    • Adam

      Many thanks for your replies in the thread linked above; great support from the guys at Quarq!

    • Peter

      Unfortunately I won’t be able to update the firmware as the Qalvin app gives “Disconnected from power meter” the moment you tap on the power meter it found :( This is on a Samsung A5 (2017 model).

      And I’m not the only one having troubles, judging from its low 1.8 rating in the playstore.

    • Chup

      Galaxy s7 android 7.0
      No problem using the app to update firmware and calibrate.

    • Hi Peter. I am sorry about the delay. I wanted to talk to our software and customer service teams first. Unfortunately we do not have a Samsung A5 in our test fleet. We have seen some issues with Version 1 of the Quarq DZero firmware and Android devices. One suggestion is to bond to the device (using the smartphone itself), then delete it, then try using Qalvin again. The low rating in the Play Store is mostly from incompatibility with Google’s own smartphones, which we are working on. I am sorry that your experience with Qalvin is disappointing. Please contact the Quarq Customer Service team on thinkfast@quarq.com if you need more help. That will be the fastest way to get any problem resolved.

    • Matthew

      @Troy,

      Any update on the timing for the release of the updated firmware?

    • Hi Matthew. It’s in Qalvin now. You can install it and ride with it. We will announce it next week.

    • Matthew

      Troy,

      I upgraded to v4 (i’m on a Quarq DZero Carbon, 110BCD, GXP) on Saturday, and did my first ride on Sunday – link to strava.com – and the power at points during the ride looked way off (<50 watts pedaling).

      I will let you know if I continue to see this. Let me know if I can provide any info to help figure this out.

    • Hi Matthew,

      Thank you for letting us know your experience with the firmware upgrade! I would recommend contacting Quarq Customer Service at thinkfast@quarq.com; they will be able to look at your ride file and help with trouble shooting.

  13. Tom Ward

    I’ve been using this PM now since Nov 2016, no issues with the unit at all. There was a few units that needed to have bluetooth ‘switched on’, but although mine needed to be, it had an issue that was unique!

    I had the previous Quarq PM, and had installed a magnet (with putty) to my BB shell some years ago, and I was having issues with PM flashing a red light, saying it needed firmware updated. Was just about to send it back to dealer to get looked at, SRAM guy on phone tells me to reset it, and says place a magnet in a certain spot, as I was doing it, the two magnets kept ‘attracting each other’, when I told him, the penny dropped.
    Tip 1. Take off old magnet!

  14. Dr_LHA

    I certainly have my choice of power meters, and all I can think with this one is that it’s so ugly…

    I guess that’s where we are now, with so many solid and low cost choices for power meters, I can choose based on aesthetics.

    • TomH

      @ Dr_LHA
      “all I can think with this one is that it’s so ugly”

      “eye of the beholder”, and all that! OTOH, I think the Pioneer is unattractive.

  15. Rab Austen

    Note about spindle lengths. If you choose the carbon crank versions, the PF30 spindle is the shorter axle version, so doesn’t fit all BB widths (e.g. BBRight). Alloy version is longer. Be careful as not all retailers are aware of this or make it clear when purchasing.

    • Fevo

      Are you sure? I would say it is the other way around. The carbon version has a longer spindle with BBRight and 386EVO compatibility, while these are not supported by the alloy version. The same is reflected on the Quarq website.

      I use the DZero carbon version without any issues for a month now, nice product! One remark on installation: the instruction for BBRight was not on their website, therefore I had to e-mail Quarq support to get the advised spacer arrangement. They replied within 2 hours with the correct instruction, great service!

    • Rab Austen

      You are correct, I meant alloy BB30 was short, so you have to order more expensive carbon for BBRight etc. Got confused after multiple edits and still sent the wrong thing :(

    • Yes, the aluminum versions will not work in BBright and BB386EVO bottom brackets. Thanks for the correction, Rab.

    • Jay

      Troy. So what you’re confirming is that I cannot install a BB30 alloy DZero on my P5 using the PF4630 BB?

    • Hi Jay. Correct. You cannot use an aluminum DZero power meter. The aluminum models are designed for BB30, PF30 and Cannondale’s BB30A bottom brackets. The spindle is not wide enough for BBRight and BB386EVO bottom brackets.

    • Jay

      Thanks Troy. I didnt check back nor did i turn on notifications on this post :-(…and it was already pre-ordered. so now having to find a new solution, will be sending my alu BB30 version back.. Which DZero would I need to buy in order to use on my P5?

      Thanks,

    • Hi Jay. The BB30 version of Quarq DZero Carbon will work. The BB30 version of the SRAM RED DZero power meter will work too — if you wanted to match a SRAM RED groupset. Both models use the same Exogram carbon crank arms.

    • Jawaad Bokhariy

      thanks!!

  16. tom

    To do so on the Quarq you’ll simply remove your feet from the pedals and then use your power meter to perform a ‘calibrate’ or ‘zero offset’

    Surely this should read ‘and then use your head unit’ ?

  17. Richard McCulloch

    I thought it was only the carbon cranks you could use on BBright? The alloy versions have warnings about not being compatible with BBright.

    Can someone clarify this?

  18. John

    Hi Ray – somewhat related, I have always wondered if there is an unintended feedback loop that impacts power output (distribution) based on single-leg power measurements. My thought is that we strive to hit power levels during training, racing, etc. – especially with power-based training methods – and that there is the potential to optimize for the “reward” by generating more power with the leg being measured. Has anyone studied this?

    • So the very limited non-scientific studies tends to show that when someone attempts to focus on one leg, it’s actually to the detriment of their total power. :(

    • Ben

      I’ve always wondered about John’s point too. With a left only power meter if you’re trying to hit a high number, you might end up training yourself to have an imbalance that favors your left leg because the right leg’s contribution isn’t being included.

      This is a different issue than whether it’s a good idea to try and correct a known imbalance.

    • TomH

      I’ve read of similar consequences when cyclists over-obsess about “equalizing” both leg powers — that it can result in less *total* power output.
      PMs like Pioneer & Garmin pedals tout that as a “feature”, but many of the guys at Wattage Forum are very skeptical, except as an aid to rehabilitation after injury.
      Maybe we’ll see some well-controlled lab studies before too long.

    • Michal

      That’s why best way to address serious leg imbalances is strength workout, stretching, physiotherapy and bike fit adjustments. Bike wasn’t made for single leg pedaling. Also focusing on displayed L/R balance and trying to even it out seems pointless and counterproductive. L/R balance is useful to evaluate if mentioned methods actually work. I wouldn’t use it for workout on the bike.

    • Bryan H

      I have been running a stages power meter for about 3 years. I wondered about this quite a bit, and when I bought the quarq earlier this year for mountain bike expected to see left leg power higher. In reality I saw 49/51 at easy riding and 46/54 (l/r) when racing. So my experience is that the stages left only wasn’t making me train my left leg better, or at least not enough to override the general leaning towards the stronger leading right leg,,,

  19. Ryan

    Do you notice any wobble in the chain ring? I have the bb30 adapter version (installed at bike shop), and it almost rubs the front derailleur in certain gears.

    • Erik

      Ryan, I’ve had my DZero since… when did they first start shipping? I must have gotten one of the first sets. Either way, I remember that installing that was a bear. I have a PF30 BB and getting the spacing right and figuring out the preload… I must be an idiot or something. I also had an issue where I torqued it to the specs indicated and it was all bound up and wouldn’t spin. At first I used the spacer configuration they had in the install sheet (online) and I had to adjust the piss out of my front derailleur. Then it started walking around on me inside the BB. So, I reinstalled the whole lot with the spacers changed around… long story short, if you think it’s off, it might be off (or the derailleur needs adjusting? or is it when you’re cross-chaining?). Take it back to the shop and have them look at it. I would, however, say that the install instructions could be a little more detailed… however, it could just be the case that I’m an idiot.

    • Ryan

      Thanks – I have di2 and the shop said everything is installed correctly…just that the spider might be partially bent (it was new). Quarq support said this can be due to engineering tolerances in the spider and/or the chain ring. The wobble is a couple mm…doesn’t quite hit the FD but is within half a mm in a non-cross chain gear. I’ll watch to see if it gets any worse or starts to rub under more load.

    • TomH

      I’ve had wobble in the new SRAM rings that came on a Riken PM. I didnt like the shifting quality on my otherwise Campy 11sp drivetrain, switched to Wickwerks rings, and those ran “true”.
      Also Wickwerks shifted better than SRAM “powerglide” rings, very comparable to OEM Campy 11sp rings.

  20. Graham

    I have an odd question in comparing the Quarq Dzero and the Watteam Powerbeat. The Dzero is heavier, about 170g to 43g, and the Powerbeat has a lot of unaero edges and stuff on your crank arm. Assuming a normal course with moderate hills, which would be a bigger penalty for toting your power meter along in a race, the Quarg weight or the Powerbeat non-aeroness (to make up a word)?

    A bit of a random question, but I have a hard time mentally having stuff in races that isn’t worth what it does and for me, the decision between these two very good power meters is which one will have the least impact on race performance (I know either way the impact is small, but still for me, this would be a deciding factor as lots of small things add up). I also realize the engine (me) is the most important thing to improve – I’m working on that every week :).

    • I guess the bigger question aside from weight would just honestly be the lack of accuracy in sprints on the WatTeam (outlined in that review). If you’re a triathlete, it’s likely a little impact. Whereas if you’re a road racer, it’s probably substantial.

  21. Pips

    I’m trying to find the Stages Gen2 analyzer and it’s trying to tell me to pay money to read the review.

    Did this not get added properly? I can’t see it anywhere.

  22. Kaue Pepe

    On polar m430 you mean m460?

  23. Noel

    Any idea if/when Quarq is going to release a DZero power meter for mountain bikes that isn’t at the Eagle level? I can’t believe there isn’t a marked for essentially just a DZero AL for mountain bikes. I don’t spend enough time on my MTB to justify Eagle-level equipment or prices.

    • Hi Noel. Unfortunately this is not currently in the works. I appreciate you asking though, because if the demand is there we may begin developing one.

    • Noel

      Troy: thanks for the response. That’s disheartening. I have Quarqs on 3 of my 4 bikes (road, TT, and CX) so I’d love to complete the set and get one for my MTB as well. But, as I mention, I just can’t justify a Eagle-level equipment for that bike.

      I have to say I find it incredibly hard to believe that there is no market demand for a sub-$800 aluminum MTB powermeter that measures full output. I can think of three friends sitting within 100 feet of me right now that would be interested. All of us have the same delimma: we’re programmers and data geeks so the inherent assumptions of single-sided measurement are unappealing but we can’t justify an extra $350 for carbon crank arms we don’t want on a mountain bike.

      I respectfully submit that Quarq really should re-think this position.

  24. Ian

    I have been using the DZero Carbon for most of this year without a problem, but there is a significant difference between the power readings i get from it and my Kickr2. Both are running the latest firmware, both are calibrated regularly but the Quarq reads anything up the 20-30w lower at 300-350w, there is more agreement nearer 200-250w but they separate as I work harder. I will usually run Trainer Road Power match to sort and ‘believe’ the DZero as that’s what I’m using to race. But have you found anything similar with the Kickr as I didn’t see if there was a direct comparison of this combo in your review (apologies if I missed it)

    • Hi Ian,

      We have tested the power outputs of Quarq DZero and previous generation power meters versus trainers. We have seen them match and seen discrepancies like you describe. In our testing, making outputs match was heavily dependent on the gear you used and in turn how fast the trainer was spinning. You could do a similar comparison test yourself using a fixed power output, moving from the top of the cassette to the bottom in uniform intervals, and comparing the intervals afterward.

      Our testing was rigorous. We warmed up and then calibrated the trainers using a spin down and checked the power meters afterward with a dynamic lab test that sweeps across a cassette.

      I would recommend using one device indoors and one outdoors, and doing an FTP test on both, to ensure your training zones are correct and that overload and fatigue are properly managed. Quarq DZero has dual ANT+ and Bluetooth Low Energy, so it becomes an option for both environments when compared to our previous generation power meters.

  25. Howard Waller

    There is one gimme that you didn’t mention. At the last major Quarq release in 2012, they changed their warranty to 2 years max (unlike, say, SRM, Power2max or Garmin, where it’s pretty much “lifetime” unless I’m mistaken). I had two Quarq fail last winter, both only 2-3 years old. They were both well looked after. One had some sort of strain gauge failure inside the spider, the other started draining the battery rapidly with an internal short-circuit. They’ll offer you a half-price replacement, but nothing more. I feel like that’s a bit of a short warranty for such a high-tech product.

    • A super quick glance at sites:

      Power2Max: 2 Years
      Garmin: 2 Years
      SRM: 3 years
      PowerTap: 2 Years

      Now, in practice most of these companies (including Quarq) tend to take a pretty lax approach to enforcing it, as you even noticed. They’ll either offer pretty good discounts or just swap out units entirely no-questions asked.

  26. John

    I wish Quarq would support 48/32T or 46/30T chainrings. Road gearing stinks for those who ride primarily on hilly gravel.

  27. Sean

    I used a Quarq Dzero for about 3 weeks and it’s currently in the process of being returned due to and error when calibrating. Not very happy, but support from ThinkFast has been good.
    When I was first calibrating the unit it showed a figure of approx -200 ish. However, when I was out on a ride, my chain came off between inner chainring and frame and ever since, my Garmin showed zero power. Tried recalibrating a number of times since and my Garmin (and the Qalvin app) and it was showing a figure of approx -1017.375.
    I have returned the unit for warranty inspection to the retailer and hopefully it’ll be replaced.

  28. Francis F.

    Hello Mr. DCR, I know that the left and right reading is only an estimate and I watched your video showing how an estimation compared to actual separate pedal based power meter, but in your experience, how trust worthy is the left-right estimate of the DZero when you’re using it normally (i.e. you’re not trying to fool the system or doing one leg drills). For example, I just finished my first workout on the trainer after I installed the DZero yesterday. According to Garmin Connect, my left-right balance is 51%-49%.

    • Michal

      Average L/R balance for longer intervals or whole rides will be quite accurate while riding outdoors (which can be seen on data provided in this interview). It might be off when riding on the trainer with less inertia because upstroke phase of pedaling is usually more prominent then and stronger leg ‘pulling’ power might be added to weaker leg ‘pushing’ power. In some extreme situations it might even report that weaker leg is stronger.

  29. Brian E.

    Technical question that I could not answer after looking at the Quarq website. In your review, you state “Since the unit isn’t a separated left/right power meter”. What exactly does that mean? It looks like it measures left/right discrepancy. Does it actually measure left and right separately, and more importantly, directly? Where are the strain gauges located for left vs right?

    Thanks!

    • Hi Brian,

      The strain gauges are in the crankset spider. The spider, chainrings and chain are what drives the bike forward, so we are measuring total power output — the combined output of both legs. To create left/right balance we split the pedal stroke into two halves. From 12 o’clock to 6 o’clock on the drive side is counted as right and 12 o’clock to 6 o’clock on the non-drive side is counted as left. I have heard this called downstream power balance, which is a decent term for it. Although it can prove useful for injury recovery, it is not a true left/right measurement.

      Our view is that cycling is an aerobic sport — oft repeated in books and by coaches — and that training focused on the body’s energy systems is what makes you faster. Sports science and studies done up to now show that a rider’s own preferred pedaling technique is the most efficient, so we concentrate on reliable, accurate total power output.

    • Brian E.

      Thanks, Troy.

  30. TomH

    Ray,
    You didnt mention if Dzero still supports a “zeroing” by back pedaling 4 times ? (or if you did, I missed it).

    BTW, I’ve found that backpedal zero can be quite wrong if you do at at moderately high, forward bike speeds. Seems the high rpm freewheeling action combined w/ back pedaling exerts a bit of torque error.
    Backpedalling in small chainring + larger cogs seems most accurate ,ie best correlation to a head unit (or a Qalvin) initiated zeroing.

    • Hi Tom. You can still zero the power meter by pedaling backward 4 times. Quarq’s Customer Service team will often say 5 times to make sure it’s done properly — to ensure you get 4 complete rotations — but 4 is correct.

  31. Aitor Altuna

    Hi Ray, thanks for the review, very useful as usual!
    One question, is Quarq going to introduce other metrics (pedal smoothnes, torque efectivenes…) as other spider based powermeters are doing (P2M NG…)?
    Thank you!

    • Hi Aitor. We do not plan to introduce other advanced metrics soon. As I wrote above, sports science and studies done up to now show that a rider’s own preferred pedaling technique is the most efficient. We continue to focus on reliable, accurate total power output. Like many others, we look forward to seeing controlled studies and journal articles on advanced metrics, to find out how they can improve performance.

      Some of the sports science to date on asymmetry and pedaling efficiency…
      1. Bilateral pedaling asymmetry during a simulated 40-km cycling time-trial. Carpes, Rossato, et al. Journal of Sports Medicine and Physical Fitness 47 (2007) 51-57.
      2. Electromyographic analysis of pedaling: A review. Hug and Dorel. Journal of Electromyography and Kinesiology 19 (2009) 182-198.
      3. Effect of Pedaling Technique on Mechanical Effectiveness and Efficiency in Cyclists. Korff, Romer, Mayhew and Martin. Medicine & Science in Sports & Exercise (2007).

    • Aitor Altuna

      Thanks Troy, really appreciate that the guys at Quarq are answering at our questions. I will read the researches, but also encourage you to introduce some metrics as the ones mentioned above into your power meters.
      Thank you!

  32. MikeS

    Has anyone had any decent time on the MTB version? Any issues with the cadence data caused by the nature of off-road riding?

    Ray, how much testing did you do on cobbles? You mention it in the test but did you see any abnormalities that might cause issues off-road?

    Cheers!

    • Hi Mike. In all of our testing we have not seen cadence problems during on off-road riding. We have found accelerometer cadence to be excellent in all but the most extreme vibration environments — roadside rumble strips being the best example. I will let Ray respond about his testing and cobblestones.

    • MikeS

      Thanks for the reply, it’s great to see companies taking the time to respond to customers in places such as this!

    • As for cobbles, I did quite a bit.

      There’s actually a bunch of files not included above that I did where I didn’t have multiple head units. For example I was doing a bunch of riding on cobbles of the Champs-Élysées back in February with it (up and down and up and down and up and down, trying to film something) – no issues.

      I also took it on the same specific stretch of cobbles that caused WatTeam issues (and some others), no problems there either. Of course, cobbles are just a fact of life in Paris, so I’m always on them.

    • MikeS

      Awesome, can’t ask for a better couple of responses! Thanks guys and cheers again to Ray for the review.

  33. iomk

    Can someone help me?

    I own a Cube bike, Shimano Ultegra FC-6800, Hollowtech II, 50x34T BB-86, does it mean i have to buy the Quarq DFour GXP spindle version? do i need to buy an extra adapter?

    • Hi iomk. The best Quarq power meter for your bike is Quarq DFour GXP, like you suggest. You must combine it with a PressFit GXP (BB86 Road) bottom bracket. Quarq power meters are built on SRAM crank arms, which use a tapered spindle. You must pair them with a SRAM bottom bracket. If you want more info on compatibility or help with selection, please email the Customer Service team on thinkfast@quarq.com.

    • iomk

      Thx Troy for the info :)

  34. dkrenik

    Following up on “Anonymous Coward’s” question as I didn’t see a response: What’s up with Specialized and Cannondale PM’s? Are there any plans to move these to the current generation of product?

    • Hi dkrenik. We continue to sell the Quarq for Specialized Power Meter Spider. We have discontinued the Quarq for Cannondale Power Meter Spider.

    • dkrenik

      Thanks Troy. I/we appreciate you taking the time to follow up with all these questions. My question is more about when might we expect the Specialized model to update to the current platform of PM?

    • Hi dkrenik. I am sorry I did not answer the second question. To remain competitive and to respect resellers who have existing products in stock we never reveal new or potential products before their official public announcement. I am not trying to infer anything there. I am simply saying I cannot tell you.

    • Steve Rubin

      It looks like they discontinued both the Quarq logo version as well as the S-works version of the specialized spider. I’m guessing Specialized ended their partnership. Going to be interesting to see what Specialized will start offering since all their top end build models had come with the S-works logo Quarq.

    • Hi Steve. Yes, days after writing that comment we sold out. We continue to offer support, like we do for all legacy products.

    • Steve Rubin

      So will there be a DZero version of the specialized spider or is that spider compatibility completely discontinued?

    • Mark McCorkle

      From what I’ve been hearing, it’s completely discontinued. Unfortunately that means if you need a new one you will have to switch to a power2max or SRM to keep using S-Works cranks.

  35. Mickey

    Hi Ray,
    any word on pricing or variation in models? My understanding is that you can basically get any sram crank as a quarq Dzero version. Which I suppose gives an opportunity for upgrades to those with a compatible crank. I think these stratifications will help comparisons greatly, as accuracy and features is starting to hit parity amongst manufacturers.

    • Hi Mickey,

      Quarq DZero power meters are offered with SRAM’s Exogram carbon crank arms and, in some cases, forged aluminum crank arms. There are several models, each compatible with different drivetrains or groupsets. The Quarq website has detailed descriptions and offers a comparison tool.

      Some bikes from Canyon, Cannondale, Cervelo, Felt, Focus, Fuji, Trek and others use SRAM RED and Quarq Prime Power Ready Cranksets that can be upgraded with a DZero power meter spider. Bikes with BBright or BB386EVO bottom brackets, such as those from Cervelo and Felt, have the Power Ready version of the RED crankset.

      All of Quarq’s DZero power meters and the Quarq Prime Power Ready Cranksets use an 8-bolt crank-to-spider interface. This is different to the 3-bolt interface found on SRAM’s Force and Rival cranksets, so unfortunately they cannot be upgraded. The standard SRAM RED crankset uses an integrated carbon fiber spider that cannot be upgraded either.

      The 8-bolt interface ensures accuracy when power meter spiders are installed and uninstalled or swapped between crank arms in the field. The 8-bolt interface is designed to mimic car wheel nuts or lug nuts. The bolts secure and center the spider on the crank arms; they make for a rigid and reliable contact point.

      Please reach out to Quarq’s Customer Service team on thinkfast@quarq.com if you want help more information or help choosing the right power meter for your bikes — now and in the future.

  36. Nedim

    I have the DZero since January or so and can recommend it.

    That said, it was not trouble free. It died on me a couple of times and Quarq support suggested tightening a screw in the battery compartment. I did that and it happened again. Since it was a weekend, I could not call them and was tinkering with it, re-tightening the screw and re-seating the battery obsessively in frustration. Eventually it all worked and the unit has not died on me again. I am fearful what will happen when I need to change it. Seems like a manufacturing issue to me.

    The app seems to have occasional trouble connecting to the powermeter and a firmware update required me to make a call to support again, since the app got stuck. Unexpectedly, the firmware update changed my settings. There are a couple of minor bugs/oddities in the app as well (like revolution counts that do not seem to be accurate), but overall it’s ok.

    I truly appreciate the fact that there are different crank sizes. Once DZero is installed and working, it has been very nice. Nothing hangs of the bike (a la Garmin or WatTeam), nothing needs tinkering with, it’s just part of the bike and the bike is now sending power data. Nice!

  37. Wesley

    Are there any compatibility limitations with regards to the type of chainrings for the DZERO? Or can I use any 5 bolt chainring from any manufacturer (TA, Stronglight, Praxis, etc.) and get still correct power measurements?

    • Hi Wesley. Accuracy is maintained if you use 5 arm/bolt chainrings from other manufacturers. The caveat is oval chainrings. Power values will be inflated 1-3%. We are developing firmware that prevents inflated values from oval chainrings, but it is not ready for testing or release. Once ready it will be a free upgrade through the Qalvin app.

    • Wesley

      Great. Thank you very much for your quick response!

    • Pietro

      Hi, can you give us an estimate of the release of the new software for oval chainrings?

      Thanks a lot!

    • Hi Pietro. The firmware for oval chainrings is still in development, so I cannot give you an ETA.

    • Pietro

      Hy Troy, thanks a lot! I own a 2017 Cannondale Scalpel with xx1 eagle, which version would fit for me, boost or standard?

      Ciao

      Pietro

    • Hi Pietro. Cannondale’s 2017 Scalpel has the Asymmetric Integration (AI) offset rear triangle and drivetrain, which pushes the chain line out by 6mm. Quarq does not have a power meter designed for AI. We offer XX1 Eagle power meters in standard and Boost 148 configurations. Boost 148 pushes the chain line out 3mm. The Boost 148 power meter is what riders typically use on Cannondale’s AI bikes. You should be aware, however, that it is not directly compatible and shifting performance can vary. We recommend you seek input from other riders who are doing this before buying one.

  38. Markus

    How are warranty issues handled outside the U.S. ? In particular in Europe (I sit in Germany).

    My experience with powermeters durability is not too good.

    2 Stages replace under warranty (these were handled within 2 or 3 days, they have a service center in Germany …. wouldn’t buy one again, though)

    2 pairs of P1 replaced under warranty (right pedals died twice …. these two processes took weeks. Apparently the importer shipped them to the US for inspection … or they are just slow).

    You always read that Quarq’s customer service is outstanding. Is this true for Europe as well? I’m about to buy a DZero, however, given my recent experiences I wonder how warranty issues are handled? Is there a European service center? There is one for SRAM but do they handle powermeters as well? Or is the potentially defective unit sent to the US?

    For me this is quite an important information.

    • Hi Markus. SRAM’s service and tech centers handle power meters. There are service and tech centers in Germany, Netherlands, France, Scandinavia and United Kingdom among others. You must work with a shop/dealer/retailer to send product to a service or tech center. Anyone worldwide can still contact the dedicated Quarq customer service team located in Spearfish (USA) for advice and support. And we work closely with the service and tech centers so customers get a consistent experience worldwide.

    • Markus

      Thanks for the response.

      However, having to go to a dealer first is and not being able to send it directly to Quarq/SRAM is a big minus for me. Depending on the dealer you lose so much more time. Given the various options out there I’d rather get a powermeter that allows me direct contact with the manufacturer.

  39. Sebastian Schönewolf

    I replaced a Dura Ace FC 9000 by a dzero al, non hidden bolt, BB30.
    The bike is a Felt DA3 2014. It used FSA 24 adapters in the FC 9000.
    Now I can move the dzero for ca 1cm from left to right (I installed the black spacer,already). The Steel axel is to far. The old FSA adapters do not fit.
    I have to buy adapters?

    I tried it with Polar M450 and V650 head units. But it only shows cadence. No power.

    • Hi Sebastian. You may need to pair the DZero Power Meter with SRAM BB30 bottom bracket bearings. There are also spacers or shims in the BB30 bottom bracket assembly that may be necessary. Please contact the Quarq Customer Service team on thinkfast@quarq.com (or call them using the numbers on the website). They will be able to help you.

  40. Sebastian Schönewolf

    It is more 3 mm than 1cm

  41. Eric Cochran

    This was advertised as being able to change chai rings without sending in for recalibration. Did you change rings out yourself? Did you see any accuracy changes?

  42. Luke Evans

    Hi Troy

    I have a Dzero eagle xx1 and it seems to be significantly under reading (by about 10- 15%) compared to my quarq red road unit and previous legacy model xx1 quarq (which it is a warranty unit for). Will updating to V4 software help this?

    Regards

    Luke

  43. Heiner

    I got a XX1 eagle DZero powermeter on my mountain bike for 2 months now. What I see sometimes is ride to ride zero offset variation I didn’t experience with other powermeters. Lowest was 399, highest 515, the variation between beginnig/end of ride is smaller though (about 10-20).

    Does anyone know whether this has an impact on the accuracy of the power data and where it comes from? The installation of the chainrings was done with a torque wrench, and I had enough rides to have it settled.

    • Michal Wozniak

      Variation between start and end of the ride is the most important. 10-20 difference is within normal margins, as far as I know, and is most likely caused by temperature shift (+/- 10-20 change of zero offset corresponds to +/- 3-6W @ 90rpm). Of course changes caused by temperature shifts are normally taken care of by temperature compensation system so accuracy shouldn’t be affected at all. Bigger zero offset drift on longer periods of time is normal too and stabilizes at some point.

  44. pedant

    “Long-time Quarq users (and Quarq themselves) know that much older generations of Quarq units (i.e. those before around 2012 or so) had a bunch of challenges with battery caps and water ingest.”

    Did you mean water ingress?

  45. Thanks for this great review again Ray !

    I see that Quarq provides 2 versions, BB30 or GXP bottom bracket version. Since you have tested a lot of different solutions which one would you recommend to upgrade a Shimano BB86 config ?
    I know there is a BB 4130 bottom bracket from Rotor or a GXP BB86 from Sram. Some peoples say that 30mm axis of BB30 is stiffer ?

    Thanks !

  46. tom

    I want to run a dfour with praxis bb30 to gxp convertor. Do I need anything other than the wavy washer that comes with the bb to install the cranks? Hoping this means I can avoid messing around with spacers etc…

    Assume that the dfour is optimized for shimano chainline etc, so providing I have the correct bb there will be no issues with my dura ace chain rings/ultegra cassette set up?

    Thanks

    • Hi Tom. You should not need anything other than the wavy washer — like you said. Quarq and SRAM GXP cranksets and power meters bolt straight into threaded GXP bottom brackets. You add a wavy washer for PressFit GXP (BB86/92). Now that’s for the standard GXP BBs. For the Praxis conversion BB, Praxis’ website says they include a wavy washer to account for bottom bracket shell width discrepancies. I would recommend that you follow their instructions. Then check that the crankset spins freely and there is no side-to-side play after you install it. The power meter is designed for the Shimano chainrings and chain line, and Praxis’ website says the chain line won’t be altered, so you should be set.

    • tom

      Many thanks for that info, although I think it is Praxis’s own o-ring washer that is designed to account for frame tolerances and the wavy washer that is gxp specific.

      Could I ask a couple of other questions lease:

      1) Is the manual offset superior to the auto (backward revolution method) and if so, what is the point of the latter?

      I know in the past there have been some differences with the figures (drivetrain friction assumption or something?), but not sure if this is long since sorted/updated.

      2) In the sram/quarq pdf manual it suggests that grease dissolving chemicals should be kept away from the unit. How does this work with your average chain cleaner then? Pretty hard to avoid contact during run of the mill bike wash.

      Thanks again

    • Hi Tom,

      1) The advantage of the manual zero offset is that you see a returned value. Monitoring this number from day-to-day verifies your power meter is healthy. We recommend manual zeroing. The backpedal zero is there so you can zero the power meter when you forget to manual zero and have already begun riding — after joining a group ride, for example.

      2) Harsh degreasers or degreasers left on for a long time can damage the power meter’s cosmetics and begin to erode its water sealing. Power washing should also be avoided. Typical bike maintenance such as chain cleaning with dedicated cleaning agents, washing with detergent and water, and hosing and drying, are okay.

      I left my SRAM RED 11-30 cassette in automotive degreaser overnight, by accident, and it was eroded. I was devastated. Some of those degreasers can be very harsh!

      I made the wrong assumption that Praxis compressible spacer was a wave washer earlier. Sorry about that.

    • tom

      Thanks again for the reply, good info.

      Tom

  47. claudio castelli

    hi troy/rebecca,

    i bought a quarq dfour one week ago. i washed the bike two times. zero offset value stayed very stable. 127/133.

    just a question:
    is this a right way to wash bike with quarq?
    this video is from team katusha (using sram/quarq).

    link to youtube.com

    i think they use paraffine then soap then they wash the bike with water.

    i use soap degreaser (chante claire normal degreaser) for 2 minutes on the chain/ front and rear derailleur and then water.

    thank you for your answer.

    ciao,

    claudio

  48. Matthew

    @Troy,

    Do the colored battery covers – link to quarq.com – fit the Dzero line? I asked this directly of Quarq support, and never heard back. I’m guessing yes, but want to know for certain before I order.

    Thanks,

    Matthew

    • Hi Matthew. Yes, they fit. I am sorry you did not receive a reply. The Customer Service team are normally very good. Best wishes for your riding and racing.

    • Matthew

      @Troy,

      Thanks

    • Matthew

      @Troy,

      Sort of related question: does this battery cap for legacy (I have a Riken on my Parlee Chebacco gravel bike) – link to quarq.com – provide better water ingress protection than what comes standard on the Riken?

    • Hi Matthew. That cap will be identical to what’s on your RIKEN power meter. If you have concerns about water ingress, please contact Quarq’s Customer Service team on thinkfast@quarq.com. They can discuss it with you in detail and, if necessary, give you advice or small parts to correct any problems.

  49. Gil OnCarbs

    Hi
    Need some help to choose the right quarq PM, pls.
    I’ve an old Shimano Ultegra 6600 triple aluminium crank. Thanx for your support !

    • Hi Gil. Unfortunately Quarq does not offer a power meter for triples. You would need to move to two front chainrings. If you’re keen to do that, the Quarq customer service team has a good understanding of SRAM’s wide-range groupsets and can offer advice. Your bike shop should have decent knowledge of wide-range offerings from every manufacturer. Sorry we can’t do more.

    • Gil OnCarbs

      Thank you for your answer !
      Can you tell me which amont i can choose with à DZero Aluminium, please? In SRAM 50-34 chainrings is it ok with a shimano ultegra derailleur and shimano chain??

    • Hi Gil. The Quarq Customer Service team are the best people to help you. Please email them on thinkfast@quarq.com.

  50. Raúl

    Hi,

    Where can I get the bowl of the stack in other colors for my dzero?

    Thanks

    • Hi Raúl. Your local Quarq distributor can recommend a shop in your region. link to quarq.com You could also order a set of colored battery covers from online retailers that stock Quarq products, such as Wiggle, Cyclepowermeters, Bike24, Bike-Components.de and, in the USA, Competitive Cyclist.

  51. Doug

    What kinda Zero offset changes did you notice between the start and finish of rides Ray?

    I normally see around a 20 point change. Although haven’t been checking so much recently. I just did a 40 mile ride that look me a little over 2 hours and the offset started at -217 (checked it around 10 minutes into the ride as forgot at the start) and by the end of the ride the offset was -261.

    Thats a 44 point change which I believe is around a 10w difference at 90rpm That’s a fairly significant change! and I don’t think I should be seeing such a big shift over 2 hours?

    All the chainring bolts are torqued to spec with a torque wrench and the chainrings have been on the bike a little while now so it can’t be anything to do with settling in still.

  52. Mihai Siman

    Dzero Red stops recording power after 5-10 min stand still in the middle of the ride. I still see the unit, still get the cadence readings but power is absent. Can’t get it back to work what ever i do.
    Calibrating returnes error 49.

    The next day it works perfectly, until another longer coffee break in the middle of the ride…

  53. Brian

    I’m getting mine in just a couple weeks! Does it broadcast in both Ant and Bluetooth at the same time? I’ve got an old Edge 705 that’s only Ant enabled, but I’d like to log the ride with Strava via an iPhone/Bluetooth as I’m too lazy to manually upload the 705 record.

    Thanks Ray.

  54. Stefan

    Anyone else having trouble joining the exclusive club of Quarq Dzero owners?

    Ordered my Eagle Dzero in March. Then SRAM Germany told my dealer I would get it in April. In April they told my dealer, sorry, June. Now they say sorry, July.

    Looking at Quarq’s website I can see “new orders ship in 14 days”. Does Quarq value its international customers less? Is this the new “America First”?

    Riding my bike without a powermeter makes me feel so naked. Not sure if I should cancel the order. In July they probably tell me August. And then, because of vacation season, September.

    Apologies for the rant but sometimes shopping can be so frustrating.

    • Quarq brought online a secondary manufacturing line back in April or so. Unfortunately though, they’re separating things out where one line is focused on Quarq.com orders, and the other on retailer/distributor/dealer orders.

    • Hi Stefan. We recognize your frustration. Thank you for speaking up. We are ensuring our distributors have product in stock – to satisfy riders worldwide — then quickly fulfilling orders from the website, online retailers and bicycle dealers so no-one waits too long. There are no priorities in the factory itself — the manufacturing team is making as many power meters as they can every day for everyone. Can you please email the customer service team on thinkfast@quarq.com and share your contact details and preferred retailer/dealer? You are waiting too long for your power meter and we want to fix that.

  55. Bin

    Hey guys I have a question about the aluminium crank, bb30 version. It comes with a longer spindle( for bb30a) and a 13mm spacer, but after installing I realized that because of the extra length and spacer on the drive side, the center of spindle is not at the center of the frame and my chainring is far out for me to shift to the big rings, does anyone have experience with that?

    • Hi Bin. This is our internal instruction on BB30A aluminium crankset installation. We will have this on the website very soon. It should give you what you need. link to quarq.com

    • Bin

      Thank you, im having bb30a crank with normal bb30 frame, is this the instruction on bb30a frame? i think i need the preload adjuster because the shims and spacer are not wide enough

    • Hi Bin. Yes, you need the preload adjuster. Please contact the Quarq customer service team on thinkfast@quarq.com if you continue to have problems. They can identify exactly what parts you need, help with the installation, and give you advice on shifting performance.

  56. Paul

    Seems to be an excellent powermeter, with great and fast support, but at the same time it is useless.
    One month ago ETA was May-29. Today ETA is unknown (according to bike dealers)
    So pre order and pay a significant amount of money and receive it sometime in the… future.
    I am afraid that I’ll have to consider other options.

    • Hi Paul. I wrote a little about this above… We have doubled production capacity. We are ensuring our distributors have product in stock – to satisfy riders worldwide — then quickly fulfilling orders from the website, online retailers and bicycle dealers so no-one waits too long. Can you please email the customer service team on thinkfast@quarq.com and share your contact details and retailer/dealer? We have product in stock and want to help you.

    • tom

      Have to say Paul, that this has not been my experience at all…

      Ordered a Quarq dfour on 29th May via UK based online retailer (I live in England). Product was set to be available from 5th June, but was happy to wait as got a good deal with Bank Holiday discount.

      However, the next day I received an email to indicate that there would in fact be a week or so’s delay and to ask whether I was happy to wait. I was fine with this, although now a little sceptical that the suggested time frame would prove accurate.

      Fears were totally unfounded however. June 12 was the date I was given for dispatch and email arrived that day to say it was on it’s way to me via 24 hour free delivery.

      Received today (13th) and was up and running in less than 90 mins with no issues whatsoever. Bear in mind that included taking down my current dura ace 9000 set up with praxis bb30 to shimano bb and changing to bb30 to gxp bb plus full installation of chainrings/cranks.

      Also had excellent support and feedback from all the folks at Quarq prior to my purchase, when no doubt boring them with numerous questions about various minor details etc :)

      Finally, ride quality/bike feel is so similar to the full shimano setup which is a real plus.

      No chance to do extensive testing of the actual data yet, but nothing to suggest that there will be any problems on that front either.

  57. Anthony DZ

    Hello there,

    I just bought and installed Quarq DZero a week ago. My question why L/R Balance is not display on the Garmin Connect?
    Could somebody give me a shade of lights how to solve this?

    Secondly, is there any other software to see the performance measurment other than Garmin Connect?

    Thanks in advance.

  58. tommy

    Anyone else find Qalvin BLE app a bit all over the place?

    I have a revolution value of 290/300 when the bike is stationary and a small torque reading at the same time.

    Then if I do a zero calibration things go bonkers and all the settings change themselves. Torque direction goes to reverse, auto zero and power balance turn off and no offset number (just loading…) displays on the main screen.

    Not really affecting my use of the dfour, as I can do most what I need via head unit, but still very odd!

    • Hi Tommy,

      I am sorry I have not replied sooner.

      Qalvin’s revolution count is used to verify accelerometer operation. It resets every 65,000 revolutions. We are considering a change to make this number more meaningful for power meter owners.

      The small torque reading is torque inherent in the power meter from assembly and installation. Bluetooth low energy has no way to prevent this from showing. Qalvin Legacy, which uses ANT+, had a small buffer so the small values were not displayed.

      Can you please contact the Quarq customer service team on thinkfast@quarq.com about the changing settings? Please give them the model and serial number of your power meter, what version of Qalvin BLE you are using, and what smartphone or tablet you’re using it with.

      Troy

  59. Wayde

    How are you deriving your calculations of zero offset drift to wattage impact in the observations of drift? n (i.e. “+/- 10 to 20 translates into +/- 3 to 6 watts at 90 RPM”) I’m curious to understand what exactly the zero offset values actually mean that shows up in my garmin 820, and at what levels would the actual number and/or any drift indicate something could be askew?

    • Michal

      Zero offset values are torque displayed in units which are 1/32 Nm (1 calibration unit = 1/32 Nm or 0,03125 Nm). So zero offset value of 100 = 3.125 Nm (100*0.03125) etc. To calculate power at given torque (Nm) you need to multiply it by 2π (6.28) and cadence and then divide by 60 (torque*2π*cadence/60).

  60. Mihai Siman

    Quarq Red issue: Power readings don’t work, I still see the unit, still get the cadence readings but power is absent. This happends random (example: morning ride works fine, evening ride power won’t work at all). Can’t get it back to work what ever i do.

    Calibrating returnes error 2!

    • Hi Mihai. Please contact Quarq customer service on thinkfast@quarq.com or speak to the dealer where you bought your power meter. The Quarq customer service team believe there is something wrong with your power meter. They said you could verify this using Qalvin BLE. The zero offset value will be significantly outside +/- 1000.

  61. Tom

    With regards to temperature compensation, German road bike mag TOUR has a powermeter test in its current issue. Lab and field tests which included temperature sensitivity tests (lab). They always take an engineering approach to testing.

    They concluded that the Dzero temp compensation does not really handle larger temperature changes very well. The competition seems to do this better (Infocrank, 2Inpower, SRM, P2M NG). Now I’m a little bit concerned about my Dzero’s accuracy.

    • Any chance you have a link to the full test?

      While sometimes they’ve done good work on power meter tests, I’ve also found cases where they’ve messed up some basics too. Just curious to see how the tests were done in more detail.