Sram: FOR TREK FRAME WITH BB90 and FRAMES WITH ITALIAN THREAD – GXP INTERFACE (NOT DUB COMPATIBLE) The SRAM RED® crankset leverages a pivotal design innovation: smaller chainrings and a wider cassette range. This leads to smoother and faster shifting up front and more useful gearing for today’s riders. The new configurations improve cadence and efficiency while also delivering shifts that are crisp, clean and quick—every time.THINGS TO REMEMBERX-Range™ gearing technology gives you more range and a smoother gear progression, so you’re always in the right gearImproved front shifting performance for crisp and accurate front shiftsUnique chainring design results in a lighter weight, stiffer, more durable cranksetDUB™ bottom bracket adds durability, simplicity and broad compatibilityCan be upgraded to a power meter SPECIFICATIONSPTA_Speeds: 12PTA_BB Compatibility: GXP/PF GXP 68mmPTA_Chainring Size: 46/33, 48/35, 50/37PTA_Crank arm length: 170mm, 172.5mm, 175mmPTA_Chainline: 45.0mmPTA_BB Spindle Interface: 24mmPTA_Chainring material: AluminumPTA_Guard: No GuardPTA_Bolt Circle Diameter (BCD): Direct Mount (DM)PTA_Crank arm material: CarbonPTA_Color (Crank arm): Natural carbon