Power measurement is a crucial part of training, so SRAM have 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.DUB-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)Speed: 12Crank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mmBB Compatibility: All SRAM Road DUB BBs, except Ai, All SRAM Road WIDE DUB BBs, except AiChainring Size: No ringsBolt Circle Diameter (BCD): Direct Moun