Mounts around the wheel axle itself, contacting the cassette directly with a first-of-its-kind Hangerless InterfaceAn overload clutch boosts resiliency and a tucked-in profile that houses protection covers on the B-knuckle and outer link that are fully replaceable, or upgradeable to the XX skid plateFull Mount attachment method creates a far stronger connection that grips both sides of the frameInstall and pair via the reliable and familiar standard AXS set-up and pairing procedureBattery not included12sp52Long1to1BLK466gUPC/EAN/GTIN: 710845892158