Sram: It’s the best of both worlds. A light and stiff direct mount chainring with accurate Quarq power measurement elegantly hidden inside the DUB spindle lets you stealthily gather the data you need to progress. So you can focus your attention on the stunning finish of the carbon fiber crankarm. The wide chainline crankset fits in road and MTB bottom bracket standards so frames can fit wider gravel tires.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 mins)Lightweight (less than 40g heavier than standard crankset)Longer DUB crank spindle accommodates both Road and MTB width frame bottom bracket standards for unmatched cross-compatibility across brandsCompatible with 135mm, 142mm and Boost rear spacing SPECIFICATIONSSpeeds: 12BB Compatibility: All SRAM Road WIDE DUB BBs, except AiChainring Size: 40TCrank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mmChainline: 47.5mmBB Spindle Interface: DUBChainring material: AluminumGuard: n/aBolt Circle Diameter (BCD): Direct Mount (DM)Crank arm material: CarbonColor (Crank arm): IridescentPower meter: YesPower Meter Type: Spindle