SRAM XX Ebike Crank Arms The XX Eagle E-MTB Crank takes from its 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 is lightweight with maximized stiffness | Sram | Xx Ebike Crank Arms 165Mm Isis