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@jetpacjimmy
When I transfer my chain and back wheel from my beater (which is 42-16) to my lo-pro (which has a 54 ring) the chain needs 2 less links. But when I drop it in to the vert drop outs the chain just isn't tight enough by about 1 links length.
So to get my 'magic gear' I need to either put in a half link or go up to a 17t cog, is that right?
Sorry, I'm a total 'tard when it comes to ratios, maths was never my strong point. I was quite surprised my chain fit too, but the chainstays are obviously much shorter on the pro than the beater. How does chainstay length effect the gearing, if at all?
J