I should know this by now, but I wanna make sure. What would I need to use a bmx crank on another type of bike, like a fixie or mtb? I know they usually come with ashtabula/american bbs(usually the cheap or bso) and english bbs. And are there possibly other types of splined sprockets that might work, since it seems like most don't seem to be bigger than a 38t or so.