I am planning on replacing my 9sp Shimano HG50 12-25 cassette with a 9sp Ultegra cassete 12-27 cassette. Will that work straight out of the box or do I need to replace the chain?
Also, do I need to do anything to the mech/shifters as the cassettes are slightly different?
Thanks a lot,
What bike and bike bits should you buy?
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