Originally Posted by
ph4nt0mf1ng3rs
If im not mistaken, it might be the difference between JIS and ISO?
I was looking on sheldon brown, and Sugino 75 falls under ISO, while RD2 cranks have JIS interfaces....I believe I found my problem. But I need confirmation of this. Never run into this problem XD.
You are right. Sugino 75 uses ISO where RD uses JIS.
From Sheldon:
ISO cranks (Campagnolo, Stronglight, others) won't go as far onto J.I.S. spindles as they ideally should.
J.I.S. cranks (most Japanese models) may bottom out if installed on ISO spindles.
In practice, you can very often get away with mixing these sizes, as long as you select an axle length that gives the desired chainline.