The Quarq Sram Red Dzero 11R 110BCD Hidden Bolt Power Meter is the perfect addition, giving accurate data straight to your ANT+ or Bluetooth head unit. Specifically designed for SRAM RED groupsets, the Quarq SRAM RED DZero 11R 110BCD Hidden Bolt Road Power Meter GXP is far above any other power meter out there, providing incredibly accurate data straight to any of your ANT+ or Bluetooth compatible head units.Using ten years of Quarq’s technological advances within the cycling world, this power meter performs in every element; no matter whether it’s pouring with rain or glistening sunlight. The IPX7 waterproof rating and 10K temperature compensation will make sure there are no anomalies in your data, ensuring that when you’re training for your event, you have the accurate numbers ahead of you. In fact, thanks to these features, Quarq are able to boost accuracy to 1.5%! Unlike other power meters on the market, Quarq have dispelled the idea of using a magnet to track cadence with the SRAM Red DZero. Using Quarq’s CNC machined processes, the aluminium spider and Exogram carbon crank arms command the low weight of the power meter - coming in at an incredible 559g. Fitting all bottom brackets, from GXP and Press Fit GXP, all the way through to BB30, Press Fit 30, BBright, BB386EVO, BB30A and PF30A - there’s bound to be a power meter to fit your SRAM RED groupset.  Quarq Sram Red Dzero 11R 110BCD Hidden Bolt Power Meter Features Bluetooth low energy technology and ANT+ wireless data transfer AxCad - no magnet 10K Temperature Compensation Battery - CR2032, 200-hour battery life, change without tools OmniCal - swap chainrings without affecting accuracy 2-year warranty IPX7 waterproof rating Accuracy - within 1.5%, measuring both legs Material: CNC Machined Aluminium Spider, Exogram™ Carbon Crank Arms Accuracy: 1.5% Bolt Circle Diameter: 110 BCD Q-Factor: 145mm Bottom Bracket compatibility: GXP, Press Fit GXP, BB30, Press Fit 30, BBright, BB386EVO, BB30A, PF30A Wireless Technology: ANT+, Bluetooth low energy technology Battery: CR2032, 200 hours of riding time Weight: 559g Head Unit: ANT+™ and Bluetooth® low energy technology compatible head units (available separately) Compatibility: SRAM 11-speed drivetrains and the SRAM RED 10-speed drivetrain. 1X and 2X. Hidden Bolt (HB) pattern only