A cluster of sprockets, commonly 5 to 11 of them, attached to a freehub on the rear wheel.

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KMC Z8S IG or HG compatibility

I have bought a KMC Z8S chain , but it slides over the rear cassette . The model of the cassette is Shimano CS-HG30-81 , it is not worn yet , and the chain length is also perfectly calculated . The ...