Power measurement at the heart of your bicycle: the DZero SRAM Red power meter by QUARQ
Built specifically for SRAM's groundbreaking Red groupset, and compatible with all of SRAM's road groupsets. The SRAM Red DZero Power Meter embodies 10 years of QUARQ's technology advances and adds new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app and compatibility with BB386EVO bottom brackets.
Information regarding the return of batteries:
You can find this information here.
Application: Road, Triathlon (power meter)
Compatibility: 1-speed, 2-speed
Chainring Mount: 110 mm bolt circle diameter, 5-arm
Series: DZero (Red)
Crankarm Material: carbon
Crankarm Length: 170.0 mm, 172.5 mm, 175.0 mm
Chainline: 45 mm
Q-Factor: 145 mm
Axle Diameter: 30 mm
Recommended Bottom Bracket: BBright, BB386EVO, BB30A, PF30A
Battery: CR 2032
Battery Life: approx. 200 hours
Measured Values: power (dual-sided), cadence, torque, pedal stroke uniformity
Measuring Accuracy: +/- 1.5 %
Protocol: ANT+, Bluetooth Smart (4.0/LE)
- carbon crankarms (chassis) with CNC machined aluminum spider (power meter)
- for SRAM 11-speed road drivetrains and Red 10-speed
- HB: hidden bolt (one chainring bolt is hidden behind the crankarm)
- change battery without tool
- auto or manual zeroing
- LED status indicator
- power meter shuts off after 10 minutes of inactivity, automatically turns on again when the crankarms are rotated
- no cadence magnet required thanks to AxCad (multi-axis accelerometer)
- 10K temperature compensation (programmed with over 10,000 data points)
- swap chainrings without affecting accuracy
- Qalvin BLE App: installation, firmware updates, zeroing, battery voltage check, system diagnostics
Operating Mode QUARQ
The crankset is the heart of your bicycle. Its sole job is to convert the effort from both legs to forward motion. It is the perfect place to measure power.
Power meters calculate power by measuring the torque (pedal force) and the angular velocity (cadence). Power = torque x cadence.
When you press on the pedals, all parts of the bikes drivetrain displace (flex) slightly under the load. Power meters are designed using finite element analysis to displace in a very controlled manner in specific locations in response to applied load. Strain gauges are used to measure the displacement and thus calculate the applied torque. Reed switches are used to calculate cadence.
Quarq's next-generation power meter platform, DZero, is named for the DZero Experiment, one of science's most accurate and innovative projects to detect subatomic particles moving at the speed of light. With a new measurement circuit, a revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, DZero represents the state of the art in power meter technology. Dual Bluetooth low energy technology and ANT+ let you choose how to capture the data. A simplified product line makes it easier to choose and install the right power meter for your bike. Increased compatibility, including Boost 148 (52 mm chainline) mountain bikes and BB386EVO bottom brackets. QUARQ Prime Power Ready cranksets can be upgraded with a Quarq DZero Power Meter Spider.
Power measurement is independent from chainring selection. Switch from road to TT chainrings without impacting accuracy. No recalibration necessary.
Displays the ratio of power generated in the right drive stroke (first half) versus the left drive stroke (second half). Lets you work on an equal pedal stroke over 360 degrees of rotation.
The hollow carbon construction maximizes the stiffness to weight ratio.
Manufacturer Part Numbers:
170.0 mm / HB: 00.3018.131.170
172.5 mm / HB: 00.3018.131.172
175.0 mm / HB: 00.3018.131.175
- 1 pair of QUARQ Red DZero cranks, power meter spider included
- battery included
- spacers and wave washer for BB386EVO included
- chainrings not included
- chainring bolts included
- bottom bracket not included
-black / 170.0 mm / HB : 559 g