Originally Posted by
bhdavis1978
Anyway, the guys at the shop said that the cassette was okay, but that the chain was really stretched, and that if I changed the chain then I needed to change the cassette and the chain ring at the same time, otherwise it wouldn't mesh well.
I don't understand this line of (common) LBS reasoning. Some tell you to replace your chain often so that it won't wear out the more expensive drive train parts, which makes sense to me. Others tell you that you should replace everything at the same time, in which case I would think you may as well run it all until it won't shift tolerably.
I admit that my understanding is thin, but I don't understand why a cassette that isn't badly worn wouldn't work well with a new chain.
Did they give you any trade-in value for the old cassette?