a buddy of mine has a set of odyssey black widow cranks that take a square taper bb that he's considering swapping to his fixie. he asked me about bb size, and i had no idea. tried to look it up and i saw it listed as working with 108, 120 and 128 on some vendors' sites. odyssey doesn't list it on their page, nor do most of the online sellers. i sent an email to odyssey but haven't heard back i know bulletproofs take something like a 107, so my best guess is the 108. just thought i'd toss it out to you guys to see if anyone knows.

as a side note. it seems like most bmx cranks that i've seen aren't listed with a matching bb size. anyone know why this is? afaik bmx has around the same chainline as fg/ss, so it strikes me as odd.