Originally Posted by
ThermionicScott
So, I'm back to being confused: are you trying to mate a single-speed crank with a different bike that already had a bottom bracket installed in it? If so, the important thing is to get the right BB for your new crank, not to get the exact same thing your frame had in it, since (as was pointed out earlier) it's probably too long for SS use.
okay okay, lets get rid of the confusion. I bought a frame to build my own fixed gear. bottom bracket was already in the frame when i got it. ive just taken it out. all i have, IS the frame. everything else is getting thrown away so i can start fresh. but i wanted to know what size i needed because i cant see cause of the rust and grime.