SRAM Rival 12 Speed Power MeterDelivering the reliability, elegance and features of Quarq’s legendary crank-based power meter, this spindle-based unit is perfect for riders who want to measure and improve their performance. Entirely contained within the DUB spindle, this model provides clean integration and fits more bikes than ever before. Benefitting from proven Quarq accuracy and dependability, it’s an invisible technology that adds minimal weight and will help you get to the finish line faster, and it can also be used to upgrade any eTap AXS bike to power. With its durable aluminium build, long battery life and lightweight, waterproof design, this is a simple and affordable power meter upgrade option.Features: Crankarm Material: Aluminium Use: Road, Gravel Power Meter Type: Spindle Bolt Circle Diameter (BCD): Direct mount (DM) Bottom Bracket Spindle Interface: DUB Bottom Bracket Compatibility: All SRAM Road DUB BBs, All SRAM Road WIDE DUB BBs Bottom Bracket Included: Not included (compatible BB’s available to purchase separately) Guard: No guard ANT+ Compatible: Yes Single or Pair: Single arm only Long battery life (400+ hours) to power a season of rides An elegant integrated design Proven Quarq reliability and accuracy User-replaceable lithium AAA battery Waterproof (IPX7 waterproof to 1 meter for 30 mins) Lightweight (less than 40g heavier than standard crankset) Simple and affordable power meter upgrade option DUB-PWR spindle-based unit measures left side power to calculate total wattsTechnologies: SRAM DUB: Forward-thinking and backwards compatible SRAM DUB BB/Crank technology is the workhorse without restraint. Designed for the most discerning pros. And riders who set it and neglect it. DUB is compatible with all major bottom bracket standards. Offering better sealing than ever before, without having to make compromises to fit all frames. Yet it opens the door for a new crank spindle for the world’s all-time lightest crankset. It’s a new approach that embraces the old. And it’s about time.Manufacturer’s Part Numbers: PMQ8303002 Black L Left Only 170mm PMQ8303003 Black L Left Only 172.5mm PMQ8303004 Black L Left Only 175mmBuy SRAM Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.