Quarq: Reach new goals and explore new roads with a power meter that delivers on accuracy, durability, and reliability. The Quarq DZero DUB Power Meter is paired with the Quarq DUB Crankarms and SRAM’s X-Glide 52/36t chainrings to have the perfect fit for most 10- or 11- speed groupsets. A SRAM DUB Bottom Bracket will be required for installation.FEATURESBluetooth low energy technology and ANT+ wireless data transferMagicZero - automatically checks and recalibrates your power meter as you ride – no need to manually calibrateAxCad -- no cadence magnet required10K Temperature CompensationBattery -- CR2032, 200-hour battery life, change without toolsOmniCal -- swap chainrings without affecting accuracy2-year warrantyIPX7 waterproof ratingAccuracy -- within 1.5%, measuring both legs. SPECIFICATIONSSpeeds: 11Crank arm length: 170mm, 172.5mm, 175mmBB Compatibility: All SRAM Road DUB BBsChainring Size: 52/36TBolt Circle Diameter (BCD): 110 BCDChainline: n/aBB Spindle Interface: DUBChainring material: Aluminum/AluminumGuard: No GuardCrank arm material: CarbonColor (Crank arm): Natural carbonPower Meter Type: Spider