Sram: OVERVIEWTriathlon. Time Trial. Cyclocross. Some disciplines are made for 1x. And 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 and simplicity.FEATURESSingle-ring drivetrain simplifies functionality and reduces weight48 and 50t variants feature direct mount aero chainrings for better aerodynamicsNon-aero chainrings can be installed with a single tool, making gearing changes a breezeSRAM X-SYNC™ wide-tooth, narrow-tooth chainring technology provides maximum chain controlLaser-etched chainring finish is more durableDUB™ bottom bracket adds durability, simplicity and broad compatibilityCan be upgraded to a power meter SPECIFICATIONSSpeeds: 12BB Compatibility: All SRAM Road DUB BBsChainring Size: 40t, 46TCrank Arm Length: 165mm, 167.5mm, 170mm, 172.5mm, 175mmChainline: 45.0mmBB Spindle Interface: DUBChainring Material: AluminumGuard: No GuardBolt Circle Diameter (BCD): Direct Mount (DM)Crank Arm Material: CarbonColor (Crank Arm): Natural carbon