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.FEATURESSingle-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: 40T, 46TCrank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mmChainline: 45.0mmBB Spindle Interface: DUBChainring material: AluminumGuard: No GuardBolt Circle Diameter (BCD): 107 BCDCrank arm material: CarbonColor (Crank arm): Natural carbon