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@NurseHolliday
I'm having brain fail. I'm currently running 52/17 which is really shit in London at 80GI, using no half links the chain is slightly slack. I can't take a link out and put a half link in because it makes it really tight. So I'm trying to use the above calculator to work out exactly what my chainstay length is (because I'm shit at measuring) to see what other gear ratios I can use. Essentially what I'm asking is, if 52/17 results in a slack chain do I need to look at ratios suggested for a longer chainstay or shorter?