Shimano CJ-8S20 is a cassette joint designed for use with Inter-8 hubs. It allows for smooth and precise shifting between 16T to 23T sprockets, even while pedaling. The cassette joint features a driver cap, pulley, bracket, and fixing ring for secure installation. It is compatible with standard and reversed fork ends, thanks to different types of non-turn washers. The CJ-8S20 ensures efficient gear shifting and enhances the overall riding experience.