Sram: 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 SPECIFICATIONSSpeeds: 12BB Compatibility: GXP/PF GXP 68mmChainring Size: 50/37Crank arm length: 167.5mmChainline: 45.0mmBB Spindle Interface: 24mmChainring material: AluminumGuard: No GuardBolt Circle Diameter (BCD): Direct Mount (DM)Crank arm material: CarbonColor (Crank arm): Natural carbon