The SRAM Rival Power Meter Upgrade Left Arm/Spindle D1 DUB brings power with every ride. SRAM have taken the reliability, elegance and features of Quarq’s legendary crank-based power meter and dropped the barrier to entry once again. This new power meter platform is entirely contained within the DUB spindle for clean integration that fits more bikes than ever. It’s an 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.SRAM Rival Power Meter Upgrade Left Arm/Spindle D1 DUB FeaturesAn elegantly integrated designDUB-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 lithium AAA batteryDUB bottom bracket adds durability and simplicityWaterproof (IPX7 waterproof to 1 meter for 30 mins)Lightweight (less than 40g heavier than standard crankset)Simple and affordable power meter upgrade optionRight arm/BB/Spider/Chainrings not includedSRAM Rival Power Meter Upgrade Left Arm/Spindle D1 DUB SpecificationsSpeeds: n/aCrank arm length: 160mm, 165mm, 170mm, 172.5mm, 175mmBB Compatibility: All SRAM Road DUB BBsChainring Size: No ringsBolt Circle Diameter (BCD): Direct Mount (DM)Chainline: n/aBB Spindle Interface: DUBChainring material: No ringsGuard: No GuardCrank arm material: AluminumColor (Crank arm): BlackPower Meter Type: SpindleHub Spacing Compatibility: n/a