SRAM Red 1 AXS Quarq Power Meter Crankset Speed: 12 Spindle: 28.99mm BCD: Direct Mount 46 DUB 170mm Black RoadSingle 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 Power readings are accurate within + 1. 5% and arent affected by climate conditions during a ride Power balance measures left and right legs separately SRAM X SYNC wide tooth, narrow tooth chainring technology provides maximum chain control Laser etched chainring finish is more