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@kerley
Whoops, sorry. You're right, I didn't understand but that's maybe because you went from a bit of slack 1 day ago to slack as fuck today. The main problem with magic gears, those chains stretch overnight :-)
Just leave all the numbers as there are apart from the chainstay length where you put in you bb - axle measurement.
Or just leave all numbers as they are and any to the left of 52X17 would make the chain tighter. Closest being 40X14 with a slightly lower gearing.