Power every ride with the SRAM Rival AXS Power Meter Arm and Spindle Upgrade Kit. This power meter platform is entirely contained within the DUB spindle for clean integration that fits more bikes than ever. It invisible technology that adds minimal weight and will help you get to the finish line faster, and can be used to upgrade any eTap AXS bike to power.Features-DUB-PWR spindle-based unit measures left side power to calculate total watts-An elegant integrated design-Proven Quarq reliability and accuracy-Long battery life (400+ hours) to power a season of rides-User replaceable lithium AAA battery-DUB bottom bracket (sold separately) adds durability and simplicity-Waterproof (IPX7 waterproof to 1 meter for 30 mins)-Lightweight (less than 40g heavier than standard crankset)-Simple and affordable power meter upgrade optionItem Specifications-Color:Black-Length:170-Spindle Interface Type:SRAM DUB