Originally Posted by
JohnDThompson
No, earlier Record bottom brackets used 11 1/4" balls on each side. I don't have a post-1990 Campagnolo bottom bracket to check, but I do have a Zeus 2000 titanium bottom bracket that uses 14 7/32" balls on each side, so I don't find that implausible.
According to the table, the axles for 3/16" and 7/32" balls are otherwise dimensionally identical. Perhaps the extra 1/16" of width of the later BBs is taken up in the cups?
Anyway, it seems plausible to me then that the SPc designation is to differentiate the later axles from the earlier SP for 3/16" balls. I think that's also the point they stopped calling the group C-Record or Record Corsa, but had reverted to simply Record.