With the accepted rule being that when you change your cassette you change your chain at the same time. My question is, can I get away with only switching the cassette as my bike is only 4 months old with 500 miles on it?
Eventually got the new cassette fitted, thankfully no issues with chain length. Was all set for a test ride then spotted 2 loose spokes, not confident enough yet on my wheel truing skills so need a quick trip to my LBS to get fixed.
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it's worth knowing how to check for chain wear/stretch, and what the effects of wear are, read here...
http://sheldonbrown.com/chains.html#wear
Planning on changing my 12-25 to a 12-27. Just need some extra gearing for the Scottish roads