Sram: FOR TREK FRAME WITH BB90 and FRAMES WITH ITALIAN THREAD – GXP INTERFACE (NOT DUB COMPATIBLE) 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 SPECIFICATIONSPTA_Speeds: 12PTA_BB Compatibility: GXP/PF GXP 68mmPTA_Chainring Size: 36, 38, 40, 42, 44, 46PTA_Crank arm length: 170mm, 172.5mm, 175mmPTA_Chainline: 45.0mmPTA_BB Spindle Interface: 24mmPTA_Chainring material: AluminumPTA_Guard: No GuardPTA_Bolt Circle Diameter (BCD): 107 BCDPTA_Crank arm material: CarbonPTA_Color (Crank arm): Natural carbon