자전거 스프라켓(카세트) 장착 하는 방법!!! 카세트 청소나 교체 할때 필요하죠 ^^

How to fit a bike sprocket or bicycle cassette is not difficult at all ^^
With the exception of the 12th tier, Simano, Sram, and Campanolo are all the same.
It would be useful if you knew about the chain change as well as the sprocket replacement ^^