Shimano Nexus CJ-C7000-5 Cassette Joint Unit Description: The Shimano Nexus CJ-S7000-5 Cassette Joint Unit is a necessary piece for installing a Shimano Nexus 5-speed internally geared hub onto a compatible bicycle frame. This joint unit supports the shifter cable and also has a lockring to secure the sprocket and other external components to the hub. Features: Each unit includes a CJ-C7000-5 Cassette joint, a driver cap, and a cassette joint fixing ring