I recently picked up a French thread Campy Nuovo Record bottom bracket lock ring. Who knows why. I tend to collect that French stuff, even though mine are in no danger of wearing out or needing replacement. Anyway, I receive it and curse; "this is no Campy Record lock ring. It's twice as thick as the ones I have on my bikes."
Then I got smart and dug out my Campy catalog
#17A . Sure enough, it states. "3.5 mm. Also available in 4. mm and 4.5 mm. So, this one measures 4.5 mm thick.
My question is, what is the application for this? I'll admit, even after reading the Record News pages on Record bottom brackets, and, my Sutherland's 2nd edition, I find all the different variables a bit confusing. Thick cups vs. thin. Different spindle lengths and width between bearing lands, etc., etc. Plus, I just don't have enough experience on enough bikes to have seen all the various applications.
So far I've asked 3 forum members via PM and received some good theories. But I thought I'd throw this up here and see what other experts say.
