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@NurseHolliday
Increasing chainstay length should mean that overall chain length increases by ~1.5 to 2 times the increase. So if I have 52x17, but it has a bit of a slack chain, and the calculator suggests it is perfect for 39.71cm, then a gear ratio suggested for 39.77 should take out a little bit of the slack? Regardless, that gear ratio should work because it's so close? If anything, it's not going to make the chain more slack. 19T sprocket here I come. I hate trial and error, I need to calculate.