So why can't I just remove the existing axle and take it down to the LBS or surf the net and find a matching cotterless axle that will allow me to use the rest of the original BB (cups, etc.), w/ new cranks and chainring? Does such a beast exist? Or is the Raleigh 20 axle / BB too odd of a size? What I want to do is put the cranks and Raleigh chainring from my now defunct Chopper ( Reissue Raleigh Chopper Frame Failure Warning ) on the 20.