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question: changing cassette(3 posts)

question: changing cassetteposter
Oct 29, 2001 1:31 PM
due to a recent knee surgury, i am pondering the thought of changing my cassette from a 12-23 to a 12-25 or 12-27. My question is this: do to the size change, must i change the chain as well?
Might have to go a link or two longer.cory
Oct 29, 2001 1:46 PM
Depends partly on how your bike's set up now. There are several good websites that give information on chain length. Park Tools has one, I think, and www.sheldonbrown.com covers EVERYTHING, so it will be in there somewhere.
An old rule is to stretch the chain around the big chainring and the big rear cog, then add one link. I've set my bikes up like that for 20-odd years with no problems.
Before you order the cassette, make sure your rear derailleur can handle a 27. I think all Shimanos can, but somebody on here will know for sure.
Without a doubt.nee Spoke Wrench
Oct 30, 2001 5:25 AM
First of all, if the chain isn't long enough to cover the big/big combination, it can cause a variety of problems. Some of the problems can get expensive.

Secondly, cassettes are expensive, chains are relatively cheap. Don't ruin your expensive new cassette by using a worn chain with it.