Bicycle Mechanics - Switching Cassettes

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Plainsman

08-27-07, 07:35 PM

I have a 12-25 10 speed Ultegra cass. on my road bike, and need another cassette to use for the trainer wheel I recently picked up. If I buy a 12-27, will I need to put on a longer chain, or is the 2 tooth difference so minor that it won't really matter?

Tapeworm21

08-27-07, 07:49 PM

Probably not, but it depends on how short your chain is now. It also depends on how many miles the 12-25 has on it. Old chains and new cassettes don't like each other most of the time.

DMF

08-27-07, 11:58 PM

Heck, get something really different. Like 11-23. You might like it, especially with a triple.

04jtb

08-28-07, 05:35 AM

i went from a 14-28 to an 11-34 on my seven speed and no problems with the chain