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does anybody know what length bottom bracket I would need to line up a Miche Primato crankset with a 6 bolt cog on a flipped shimano mtb rear hub?
One so long that it doesn't exist*. The nominal chainline on Primato square taper is 42.5mm on a 107mm axle, the minimum chainline for a 6-bolt flat sprocket on a 135mm rear hub is 54mm
*This is hyperbole - a 131mm BB, which can be obtained quite easily, will get you close enough. You need to check with long BBs whether they're asymmetric, for example a 127mm or 128mm offset BB might also work.
gbj_tester
Incredibly niche question but does anybody know what length bottom bracket I would need to line up a Miche Primato crankset with a 6 bolt cog on a flipped shimano mtb rear hub? Or any way of working it out? I don't currently have a square taper bb to test and measure