Power measurement is a crucial part of training, so weve 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. Its invisible technology that adds minimal weight and will help you get to the finish line faster.SRAM Force AXS Groupset ReviewKey Features:DUB-PWR spindle-based unit measures left side power to calculate total watts Proven Quarq reliability and accuracy Long battery life (400+ hours) to power a season of rides User replaceable AAA lithium battery DUB bottom bracket adds durability and simplicity Waterproof (IPX7 waterproof to 1 meter for 30 minutes) Lightweight (less than 40g heavier than standard crankset) Specifications:Speeds: 12 Crank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mm BB Compatibility: All SRAM Road WIDE DUB BBs, except Ai Chainring Size: No rings Bolt Ci