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QUARQ DFour DUB power meter carbon crankset - with 4-arm spider for Dura Ace
The QUARQ DFour DUB power meter carbon crankset is composed of two highly moulded carbon crankarms, a DUB axle and the DFour DUB power meter spider. It is your entry into the world of performance measurement - as long as you ride with your Road Dura Ace R9100, Ultegra R8000 or 105 R7000 chainrings. This light, strong and elegant crankset combines the clever DUB platform with the DZero power meter technology, which has been proven over many years.
Information regarding the return of batteries and electrical equipment:
Information on the return and disposal of used batteries, accumulators and electrical equipment can be found here.
Application: Road, Triathlon & Time Trial
Type: power meter cranks (on both sides)
Chainring Mount: 110 mm bolt circle, 4-arm asymmetrical
Series: DZero (DFour)
Crankarm Material: carbon
Axle Material: aluminium
Crankarm Length: 170.0 mm, 172.5 mm, 175.0 mm
Chainline: 45.5 mm
Axle Diameter: 28.99 mm
Recommended Bottom Bracket: all SRAM Road DUB
Tolerance: +/- 1.5 %
Point of Measurement: spider
Power Source: CR2032 lithium battery
Battery Life: approx. 200 hours
Data Collected: power (dual-sided), cadence, torque, pedal stroke uniformity
Data Transfer: ANT+, Bluetooth
- expressly for Shimano Dura Ace R9100 11-speed chainrings
- Ultegra R8000 and 105 R7000 chainrings are compatible, but do not fit optically
- carbon crankarms with DUB axle and 8-bolt interface, power meter spider, chainrings
- tool-free battery change
- 10K Temperature compensation
- no cadence magnet required thanks to AxCad (multi-axis acceleration sensor)
- automatic recalibration while riding
- easy chainring change without recalibration
- natural carbon finish
- SRAM AXS app for zeroing, battery status, diagnostics and firmware updates
QUARQ Operating Principle
The crankset forms the heart of your bike. Their only task is to convert the force of both legs into forward motion - the perfect place to measure performance.
Power meters calculate power by measuring torque (pedal force) and angular velocity (cadence). Power = torque x cadence. When you pedal, all parts of the bicycle drivetrain shift (bend) slightly under the load. Power meters are designed using FE analysis so that these displacements take place in a very controlled manner and at specific locations in relation to the applied load. Strain gauges are used to measure this displacement and calculate the applied torque. Reed switches are used to calculate the cadence.
DZero is QUARQ's next generation power meter, named after the DZero Experiment, one of the most accurate and innovative scientific projects to discover subatomic particles. With a revised measurement loop, optimised strain gauge design, increased accuracy and the features of the Qualvin and SRAM AXS app, DZero represents the state of the art in power meter technology. You can choose between Bluetooth LE and ANT+ technology for data transfer.
The power measurement depends on the choice of the right chainring. Change from a Road to a Time Trial chainring without sacrificing accuracy. No recalibration necessary.
Calibration takes place automatically during the ride. You don't need to pedal backwards or perform a manual calibration from your computer.
Manufacturer Part Numbers:
170.0 mm: 00.3018.292.170
172.5 mm: 00.3018.292.172
175.0 mm: 00.3018.292.175
- 1 x QUARQ DFour DUB power meter crankset
- 1 x CR2032 battery