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Eagle DUB power meter Boost spider by QUARQ - the Eagle power meter
The QUARQ Eagle DUB power meter spider for Boost bikes shows SRAM Eagle XX1 riders a way into a new world - the world of power measurement. It is based on the DZero technology, which has been tried and tested for years and scores with such practical features as temperature compensation, automatic calibration and integrated cadence sensors. Performance data is measured on both sides with an accuracy of 1.5 %. In addition, the power meter is of course equipped with ANT+ and Bluetooth. All you need to get started is the XX1 Eagle DUB crank with 8-bolt interface and the matching X-Sync 2 chainring with 104 mm bolt circle.
Information regarding the return of batteries and electrical equipment:
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Application: Cross Country
Type: spider with power measurement
Chainring Mount: 104 mm bolt circle, 4 arm
Series: DZero (Eagle)
Chainline: 52 mm
Axle Diameter: 28.99 mm
Recommended Bottom Bracket: SRAM 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
- QUARQ XX1 Eagle DUB cranks with 8-bolt interface
- SRAM X-Sync 2 chainring with 104 mm bolt circle
- SRAM AXS app for zeroing, battery status, diagnostics and firmware updates
- 8-bolt interface
- DUB: stronger, stiffer, lighter
- spider produces a Boost chainline
- double-sided power measurement
- tool-free battery change
- 10K temperature compensation (programmed with over 10,000 data points)
- no cadence magnet required thanks to AxCad (multi-axis acceleration sensor)
- automatic recalibration while riding
- easy chainring change without recalibration
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 the chainring without loss of 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 Number:
- 1 x QUARQ Eagle DUB Boost power meter spider
- 1 x CR2032 batteries