i've recently bought a 1980's raleigh grand prix.so i know this bike have a lot of different sizes about bb or hub and etc..but what about the front fork?if i wanna change the front fork,bcoz a new wheel won't fit,what can i do?or maybe i just change rim and spokes?what you think?and then i try to do a fixed gear.so can i keep the original bb and just change the crankset?cheers guys.