quarq red axs aero cranksetSingle ring drivetrain simplifies functionality 48 and 50t variants have fully integrated power into a direct mount aero chainring 36 46t variants have spider based power Chainrings can be easily changed without requiring recalibration of the power meter Power readings are accurate within + 1. 5% and aren't affected by climate conditions during a ride Power balance measures left and right legs separately SRAM X SYNC wide tooth, narrow tooth chainring