>>1979667there's no way to calculate this because you need also to know the chainleght measure (distance from bottom bracket to center of rear wheel) so the calculation of the optimal chain lenght is done on the bike. eyeballing it, it should work good on all the gears except the 46. at the 46 it should be really tense but not explosive, you can maybe try it. if on 46 the derailleur doesn't go further than picrel then you are good to go