Sram: With multiple World Championship medals, EWS series wins and Olympic gold medals to its namesake, the pedigree of XX is well established in the court of elite racing. the XX Eagle E-MTB Crank takes from that race-winning lineage and is optimized for E-MTB use. Carbon fiber engineered with a foam core to give both incredible strength and maximized stiffness under the high torque environment of E-MTB. Paired with the new XX Eagle Transmission (T-Type) direct mount chainring, performance and design aesthetic blend together to provide our most premium, performance driven crank arm.FEATURESCarbon with foam core. Light with maximized stiffness.Stunning, never-before-seen look.Industry-leading shift performance.  SPECIFICATIONSSpeeds: 12BB Compatibility: ISISChainring Size: n/aCrank arm length: 165mm, 170mm, 175mmChainline: n/aBB Spindle Interface: ISISChainring material: n/aGuard: No GuardBolt Circle Diameter (BCD): n/aCrank arm material: CarbonColor (Crank arm): BlackPower meter: n/aPower Meter Type: n/a