Sram: Power measurement is a crucial part of training, so we’ve made it as easy as possible to upgrade your Force AXS ride with Quarq technology. DUB-PWR takes the legendary reliability and accuracy of Quarq technology and inserts it into the crank spindle for clean integration that fits more bikes than ever. It’s invisible technology that adds minimal weight and will help you get to the finish line faster.FEATURESDUB-PWR spindle-based unit measures left side power to calculate total wattsProven Quarq reliability and accuracyLong battery life (400+ hours) to power a season of ridesUser replaceable AAA lithium batteryDUB bottom bracket adds durability and simplicityWaterproof (IPX7 waterproof to 1 meter for 30 minutes)Lightweight (less than 40g heavier than standard crankset) SPECIFICATIONSSpeeds: 12Crank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mmBB Compatibility: All SRAM Road DUB BBs, except AiChainring Size: No ringsBolt Circle Diameter (BCD): Direct Mount (DM)Chainline: n/aBB Spindle Interface: DUBChainring material: No ringsGuard: No GuardCrank arm material: CarbonColor (Crank arm): IridescentPower Meter Type: SpindleHub Spacing Compatibility: n/a