Sram: We pioneered the 1x drivetrain, and the SRAM Force® 1 crankset evolves the innovation. It's lighter, stronger and simpler-non-aero chainrings can now be installed with a single tool. For cross, TT, tri and crits, this is the king of 1x.THINGS TO REMEMBERSingle-ring drivetrain simplifies functionality and reduces weight48t variant has 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 controlDUB™ bottom bracket adds durability and simplicityCan be upgraded to a power meter SPECIFICATIONSSpeeds: 12BB Compatibility: All SRAM Road DUB BBsChainring Size: 40Crank arm length: 170mm, 172.5mm, 175mmChainline: 51.0mmBB Spindle Interface: DUBChainring material: AluminumGuard: No GuardBolt Circle Diameter (BCD): 107 BCDCrank arm material: CarbonColor (Crank arm): Natural carbon