Originally Posted by
shuffles
Thanks for the responses!
So, how will I know if I should get a 27 or 28? Also, when do you know your shifters are worn out, and not just the cables?
Thanks.
Cables and cable housings are cheap and easy to install. Replacing these can sometimes make a big improvement to shifting performance. Hosing out the insides of the shifters can help clean them and soften old hard grease. When these two tricks don't help it's probably time for new shifters. The shifters are the most expensive part of a drivetrain upgrade and are a benchmark for timing the upgrade.