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Quarq’s dedication and expertise has placed it at the forefront of bicycle power meter technology. Professional cycling teams, Ironman champions and Olympic gold medalists ride and race with Quarq power meters.

Power Meter Features

Power Balance™ 
Power Balance uses crankset torque to display the ratio of power generated in the right drive stroke (first half, 0-180°) versus the left drive stroke (second half, 181-360°) for each crank revolution. Power Balance is used by sports scientists to test asymmetry and is an excellent aid for injury recovery. The Quarq ELSA 10R and SRAM RED Quarq power meters are equipped with Power Balance.

Omnical™ 
Power measurement is independent from chainring selection. Swap chainrings without impacting accuracy. No recalibration necessary.

Exogram™ 
ELSA 10R's Exogram hollow carbon crank arms maximize the stiffness to weight ratio.

Tool-less, user-replaceable battery 
ELSA 10R, RIKEN 10R and the RED power meter use an industry standard CR2032 battery with over 300 hours of riding time.

LED 
Blinks when the power meter wakes from sleep, at the end of the ANT+™ calibration (set zero) command and when you back pedal to Auto Zero. The LED will also verify if a head unit is paired with the power meter.

+/- 1.5% accuracy 
Each power meter is individually calibrated at the factory. Calibration values are stored on the power meter for seamless interchangeability between cycling computers.

ANT+™ 
Embracing the ANT+ standard gives you the flexibility to choose any ANT+ compatible cycling computer.

How Power Meters Work

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 power meters use a proprietary strain gauge arrangement and precision digital circuitry to deliver high accuracy and low power consumption for optimal battery life.