Triathlon. Time Trial. Cyclocross. Some disciplines are made for 1x. & while our X-Range™ 2x set up has integrated much of the simplicity of a 1x system, there are still times when a single ring is best. The SRAM RED® 1 crankset offers the most demanding racers the right mix of features—aerodynamics, durability & simplicity. Single-ring drivetrain simplifies functionality & reduces weight 48 & 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, simplicity & broad compatibility Can be upgraded to a power meter