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change derailluer when change cassette?(2 posts)

change derailluer when change cassette?Qubeley
Nov 21, 2002 3:48 PM
Hi, I am currently running 11-21 on my bike, if I put 25 or 27 on it, do I need to change rear derailluer as well?
nopetrekkie1
Nov 21, 2002 3:54 PM
Same number speeds, you're fine. Might have to make some adjustment to the chain length, though.