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.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 Waterproof (IPX7 waterproof to 1 meter for 30 minutes) Lightweight (less than 40g heavier than standard crankset) Left arm and spindle only SRAM Model ID: PM-FRC-ASSY-D2 Attributes BB Inclusion No Connectivity ANT+, BT LE Crank Spindle Diameter 28.99mm Crank Arm Length 167.5mm Interface DUB Crankset Material Carbon Pedals Thread 9/16'' Primary Color Black Drivetrain Spacing Road