Shimano CJ-8S40 Nexus Cassette Joint Unit Description: The Shimano CJ-8S40 Nexus Cassette Joint Unit is a necessary piece for the optimum shifting performance for a Shimano Nexus internally geared hub. This joint unit supports the shifter cable and also has a lockring to secure the drive sprocket and other external components to the hub. Features: Each unit includes a CJ-8S40 Cassette joint, a driver cap, and a cassette joint fixing ring Compatible with Nexus SL-S500 and SL-S503 IGH shifters, and the SG-5R35 NEXUS 5-Speed Internal Hub (sold separately)