I want to change my cassette from 11-25 to 12-27. I bought a new 10-speed cassette but I wondered if I need to change the length of the chain with the bigger rear cassette?
A: Thanks for the email, Leon. Unless you have something unusual in the way of a crankset or rear derailleur, that should work fine without changing the chain length. I ride a standard 39/53 Shimano Dura-Ace 10-sp drivetrain and have 2 wheels equipped with those same cassettes and I switch back and forth all the time and it works just fine.