SRAM Force AXS 1X Crankset w/ Power Meter 50T Aero Chainring - E1Power meter is fully integrated into the chainring for lighter weight and greater accuracy Power readings are accurate within + 1. 5% and arent affected by climate conditions during a ride Measures right and left leg power balance DUB bottom bracket adds durability and simplicity Available in 160, 165, 170, 172. 5, and 175mm crankarm lengths