I'm going to be replacing my rear derailluer pretty soon, It's a shimano altus, from the research I have done I think that it is a 7-speed, I want to upgrade to a deore derailluer but it is marked as a 8/9 speed derailleur. My question is this if I am to swap these out, what else do I need to replace? cassette/ shifters/ chain?
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Thread: Replacing my rear derailluer