Sram Red AXS 1x DUB Aero 175x48 Aero DUB crankset silver/greySRAM RED 1 AXS Crankset 175mm 12 Speed 48t Direct Mount DUB Spindle Interface Natural Carbon D1. The SRAM RED 1 AXS crankset features exceptional 1x drivetrain design. It provides the simplicity and tighter gearing range that is well suited for road racing and riding in flatter terrain where a wide range would go unused. The crankset is designed specifically for electronic shifting and can be upgraded to a power meter. Single ring drivetrain