SRAM Red 1 AXS Crankset Speed: 12 Spindle: 28.99mm BCD: Direct Mount 50 DUB 175mm Black RoadSingle ring drivetrain simplifies functionality and reduces weight 48 and 50t variants feature direct mount aero chainrings for better aerodynamics Non aero chainrings can be installed with a single tool, making gearing changes a breeze SRAM X SYNC wide tooth, narrow tooth chainring technology provides maximum chain control Laser etched chainring finish is more durable DUB bottom bracket adds durability and simplicity Can be upgraded to a power meter