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2 comments
*Some* wear on the cassettes is tolerable.
Think about it. Many of us will go through, say, three chains over the life span of one cassette. I have a part worn cassette on the spare wheel I pop on on my winter bike when I use it on the turbo. It works fine. Assuming the cassette isn't observably worn out:
New chain on old cassette = OK; old chain on new cassette = not OK.
It's not ideal, but it really does depend on how worn the cassette is. You should notice pretty quickly if the cassette is worn enough to be scrap.
I presume the old cassette has the same size largest sprocket and doesn't need a longer chain.