I have a late 80s Bianchi frame with Italian-threaded BB, which I assumed was standard. Thought I could replace the fixed cup style with newer Campy Ultra-Torque cups and Veloce crankset, BUT, the cups won't thread into the BB shell - they just spin and don't engage the threads. The cups ordered were for a 68mm BB shell. I have not measured the actual width, but suspect it is 70mm, which I believe is the old standard.

My questions:

1) Is there a difference in (cup) diameter between 68mm and 70mm BB shells that would account for this issue with the cups?

2) Is the 68mm Italian made for newer bikes? I thought 68mm was for English-threaded BBs.

Thanks!