Sram`s most advanced aluminum cranks paired with their most accessible power measurement systemSpindle-based unit measures left side power to calculate total wattsLong battery life (400+ hours) to power a season of ridesLightweight, coming in less than 40g heavier than the standard cranksetIntegrated one piece chainrings offer crisp accurate shiftsDUB bottom bracket adds durability and simplicityUser replaceable AAA lithium battery160x48/35DUBBLKDirect Mount2x12UPC/EAN/GTIN: 710845916212