i found it, somewhere... cant recall where atm, but if anyone else was curious, or might need the info later, for an 01 GSXR 1000 the clipon size is 50mm
and if you just check the vortex site then all you will see is a list of the clipsons they sell ranging from about 40 - 60 mm (something like that anyways, that is probably a little exaggerated) and they dont tell what sizes go with what bikes.
so again '01 GSXR 1000 = 50mm clipons
