Shimano CJ-S7000-8 Alfine Cassette Joint Unit for Belt Drive System Description: The Shimano CJ-S7000-8 Alfine Cassette Joint Unit for Belt Drive System is a necessary piece for installing a belt drive onto an 8-speed Shimano Alfine internally geared hub. This joint unit supports the shifter cable and also has a lockring to secure the belt drive sprocket and other external components to the hub. Features: Each unit includes a CJ-S7000 Cassette joint for belt drive system, a driver cap, and a cassette joint fixing ring Alfine hub, sprocket, and other hardware sold separately