Sram: The crank is the very center of our X-Range gearing philosophy. With tight 13-tooth gaps between chainrings paired to wide-range cassettes, riders get more range while shifting less frequently and staying in the big ring longer. Previously only available on RED, our integrated chainrings are light, stiff, and incredibly durable. The black finish mated to dazzling glossy carbon arms will elevate any bike.FEATURESUnique chainring shape results in a lighter weight, stiffer, more durable cranksetX-Range gearing technology gives you more range and a smoother gear progression, so you’re always in the right gearCrisp and accurate front shiftsCarbon fiber crankarms for light weight and stiffnessDUB bottom bracket adds durability and simplicity50/37T, 48/35T and 46/33T chainring combos availableCan be upgraded to a power meter SPECIFICATIONSSpeeds: 12BB Compatibility: All SRAM Road DUB BBsChainring Size: 50/37TCrank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mmChainline: n/aBB Spindle Interface: DUBChainring material: AluminumGuard: n/aBolt Circle Diameter (BCD): Direct Mount (DM)Crank arm material: CarbonColor (Crank arm): Grey w/Laser FoilPower meter: NoPower Meter Type: n/a