SRAM Apex D1 AXS Wide Left Crank Arm Power Meter Spindle Accurate, reliable power measurement is practically a requirement these days, and the Apex AXS crankarm power meter upgrade is the easiest way to get precise power numbers. 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 Waterproof (IPX7 waterproof to 1 meter for 30 minutes)DUB bottom bracket (Sold separately) adds durability and simplicity Right crank arm, bottom bracket, spider, and chainrings NOT included SPECIFICATIONSVariant MFG#160mm00. 3018. 346. 000165mm00. 3018. 346. 001170mm00. 3018. 346. 002172. 5mm00. 3018. 346. 003175mm00. 3018. 346. 004 | Sram | Apex D1 Axs Wide Left Crank Arm Power Meter Spindle 172. 5Mm