Sram S975 Quarq Power Meter Crankset
SRAM’s S975 Quarq power meter is compatible with all of SRAM’s road groupsets and features an integrated carbon crank arm and proven Black RED chainrings.
At 779 grams (GXP, 130BCD), the S975 is a lightweight leader for wireless power devices.
It is accurate to +/- 2% and features a tool-less, user-replaceable battery and ANT+™ technology,
which gives it the flexibility to work with any ANT+™ compatible display unit.
The S975 is a proven performer in all environments – road, triathlon and cyclocross.
It comes in full size and compact with standard, TT/triathlon or cyclocross chainrings and is compatible with GXP,
Press Fit, BB30, Press Fit 30 and BBright bottom bracket systems.
- +/- 2% accuracy
- Tool-less, user-replaceable battery
- ANT+™ compatible
The S975 is the choice of the Kenda/5-Hour Energy presented by Geargrinder professional cycling team and pro triathletes
Heather Jackson, Pete Jacobs, Luke McKenzie and world record breaker, Marino Vanhoenacker.
- Arm Material:Unidirectional Carbon
- Chainring Material:SRAM Red PG Chainrings with Anodized Coating, Alloy Chainring Bolts
- Weight:779g (172.5mm, 130BCD, GXP)
- Available Arm Lengths:170mm, 172.5mm, 175mm, 177.5mm
- Available Ratios:53/39, 50/34
- Compatibility:Compatible with SRAM Black RED and SRAM Force, Rival and Apex
- Bottom Bracket:GXP, Press Fit GXP, BB30, Press Fit 30, Bbright
- Chainrings:SRAM Black RED
- Head Unit:ANT+™ compatible head units including Garmin Edge® 800, Garmin Edge® 500 and Garmin Forerunner® 310XT (available separately)
- Software:Training Peaks WKO+®, Training Peaks®, Golden Cheetah, Strava® (available separately)
- Battery Type:CR2450 - over 400 hours of riding time
- Wireless Technology:ANT+™
- Material:Carbon crank arms, CNC machined AL spider
Quarq technology powers SRAM’s road power meters including the groundbreaking SRAM RED Quarq Power Meter.
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.
SRAM power meters use a proprietary strain gauge arrangement and precision digital circuitry to delivery high accuracy and low power consumption for optimal battery life.
Inside Quarq Power Meters:
ANT+™: A wireless standard for bicycle electronics that ensures interoperability between sensors and bike computers from different manufacturers.
OmniCal™: Power measurement is independent from chainring selection. Switch from road to TT chainrings without impacting accuracy. No recalibration necessary.
Power Balance™: 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.