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. FEATURES Carbon with foam core. Light with maximized stiffness. Stunning, never-before-seen look. Industry-leading shift performance. SPECIFICATIONS Speeds: 12 BB Compatibility: ISIS Chainring Size: n/a Crank arm length: 165mm, 170mm, 175mm Chainline: n/a BB Spindle Interface: ISIS Chainring material: n/a Guard: No Guard Bolt Circle Diameter (BCD): n/a Crank arm material: Carbon Color (Crank arm): Black Power meter: n/a Power Meter Type: n/a CRANK CAP/CHAINRING/BB NOT INCLUDED