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Industry literature discussing powermeters is replete with hyperbolic claims, but Quarq's SRAM Red DZero Power Meter Crank Arms for GXP bottom brackets enjoy a pedigree that speaks for itself. The Red DZero is the latest member of a family that includes wins in the most prestigious races in the world, ranging from Roubaix to Paris and Kona. It incorporates every advancement that Quarq has made in power meter technology over the last decade, and it combines those advancements with an improved measurement circuit for even more accurate data across variable external conditions.
As with the rest of the DZero line, the Red model still incorporates five strain gauges strategically placed throughout the spider in order to measure the Newton meters you're throwing into the pedals, and—except for the alloy spider—it features the same Exogram carbon crank arms and graphical treatment as the standard Red crank. It's also still got the same claimed accuracy of +/- 1.5%, so its numbers are 0.5% more accurate than most meters, but the new design requires less correction in order to maintain accuracy in drastic temperature changes. Fewer corrections mean the latest SRAM Red power meter model also better rations battery life than the previous generations, though when the battery does go out, you can still change it without tools or having to ship the whole thing to the manufacturer.
The Red DZero system's accuracy is further boosted by the return of Quarq's 10k dynamic temperature compensation technology, which alleviates the need for constant, mid-race zeroings in variable conditions. Even if it's just coasting for a few seconds or toggling through your head unit to the proper option, it can still be the difference between winning and losing. It's also obnoxious as hell. The DZero is equipped with an auto-adjust schedule based on a constellation of around 10,000 data points that chart how the unit responds to temperatures ranging from zero to 130 degrees Fahrenheit. This lets the power meter figure out the atmospheric details for you with minimal drift, so you can focus on turning the crank, not babysitting it.
The DZero with SRAM Red branding also hosts Quarq's Power Balance and Omnical features, which record total output and output for either leg individually (Power Balance) and let you swap chainrings without recalibrating or negatively impacting accuracy (Omnical). As with previous Quarq models, the DZero communicates to your head unit via ANT+ wireless, but Quarq also adds Bluetooth to this generation. Up till now, we've always tempered the obligatory head unit-compatibility statement by writing that your current computer is likely already compatible with the power meter; now, we can just state outright that it is compatible.
We recognize that there is value in cycling components that can stand up to the elements we often encounter throughout the course of a year of training, but Quarq demonstrates its penchant for being overly thorough by ensuring that the unit's internals can handle comically extreme conditions. The system is waterproof for 30 minutes while submerged under one meter of water, a feature that will come in handy on days you take your bike on the swim leg, too.
Since the DZero is effectively a catch-all for almost every bit of tech Quarq has thrown at the power meter problem over the past decade, it includes the AxCad accelerometer, which provides cadence information without any additional sensors or magnets. The DZero is also compatible with training software suites including Training Peaks WKO+, Training Peaks, Golden Cheetah, and Strava. Unlike previous versions, the DZero's Bluetooth compatibility lets it sync with the Qalvin BLE app to easily tune, tweak, and set zero offsets.
- Equip your Red drivetrain with reliable, economical power metrics
- Improved precision from redesigned strain gauge circuits
- Provides power for right and left legs separately
- Exogram carbon fiber crank arms for uncompromising stiffness
- Broadcasts via ANT+ and Bluetooth protocols
- Requires less correction for better data and longer battery life
- Battery can be changed by home mechanics without tools
- Compatible with GXP bottom brackets and adapters
- Item #QRQ000V
- Q & A
Left / Right Balance
I bought this power meter for its capabilities to measure both left and right crank power. I had some issues with leg length and I wanted to assess the difference in power. Since buying and riding with this power meter and focusing on some corrective exercises, I have brought my balance down to 49/51 and this would not be easy to assess without this Quarq.
I've owned or had experience with every power meter on the market and theres no beating the value, reliability, accuracy, or weight that Quarq offers.
Sure, there are cheaper single arm power meters, but all they do is double the power on the left side. If you pick one up without knowing of a possible leg imbalance (I personally have a 54:46 split because of a past injury), your power numbers may be 10% high or low, which negates their claimed 2% accuracy.
Quarqs also have a proven track record. Many of the newer companies out there have only had their product out for a few years, and many are on their second or even first versions of public release units. The DZero is the culmination of 10 years of technology at Quarq, and it is their third major release, fixing a few small issues that were present on the previous Elsa and Riken.
The DZero has a +/-1.5% accuracy which means you can trust your power numbers. I've used other power meters in the past which claim +/-2%, but all their numbers have always seemed at least 5% off from my Quarq numbers. The last thing you need when you are training is to not be confident in the data you have, it just takes away one more variable.
The Red DZero only differs from the DZero Carbon in the graphics on the crank arms and the fact it is only available in hidden bolt.
Heres some weights, verified on my scale:
110mm BCD NHB Spider - 122.0g
8 Retention Bolts - 7.8g
165mm GXP Carbon crank arms - 416.0g
Complete DZero Carbon NHB GXP 165mm - 545.8g
Feel free to reach out with any questions you may have!
Precise, and consistent
- Familiarity: I've put it through the wringer
Bought the GXP version for a Dogma F8 build. I have always been a fan of Quarq, and the new D Zero is no exception. Excellent quality, and accuracy at a great price point.