Quarq: Every innovation in Quarq’s DZero platform represented the 10+ years of Quarq’s advances in power meter technology. This same platform is now combined with SRAM’s innovative DUB technology to bring you the simplest spider-based power meter. Simplified part choices, quality materials and a broader compatibility for bottom brackets and chainrings, brings power on every ride. FEATURES Bluetooth low energy technology and ANT+ wireless data transfer MagicZero - automatically checks and recalibrates your power meter as you ride – no need to manually calibrate AxCad -- no cadence magnet required 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. SPECIFICATIONS Speeds: 11/12 Crank arm length: n/a BB Compatibility: DUB:BSA73, PF89.5, PF92, PF30 MTB73, BB30 MTB73, BSA MTB68SP Chainring Size: No rings Bolt Circle Diameter (BCD): 104 BCD Chainline: n/a BB Spindle Interface: DUB Chainring material: No rings Guard: No Guard Crank arm material: n/a Color (Crank arm): n/a Power Meter Type: ANT+ and BLE