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The crank is the very centre of SRAM s 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, SRAM s integrated chainrings are light, stiff, and incredibly durable. The black finish mated to dazzling glossy carbon arms will elevate any bike.Unique 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 fibre 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 meterSpeed: 12BB Compatibility: All SRAM Road DUB BBsChainring Size: 46/33T, 48/35T, 50/37TCrank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mmChainline: n/aBB Spindle Interface: DUBChainring material: AluminiumGuard: n/aBolt Circle Diameter (BCD): Direct Mount (DM)Crank arm material: CarbonColour (Crank arm): IridescentPower meter: NoPower Meter Type: n/a