Originally Posted by
Ghrumpy
Yes, "different" is the word. They are not even close; you can tell them apart from 100 ft. away.
Super Record of course has some differences from Record as well. The crankarms themselves are the same. Not just similar, but same part number. The only difference is the chainrings.
A true Super Record BB, on the other hand, will have a titanium spindle. Record, Nuovo Record, and C-Record have steel spindles, but all different from each other, and not compatible with each others' cups. The only cups that will interchange are the SR and CR.
With all due respect, it's not a "decent approximation." It's a factory specification.
The original spindle length for Record, Nuovo Record, and Super Record was 113mm, and yes, not symmetrical. Depending on the spindle, it was originally 1-2mm longer DS than NDS. Their Record triple spindle was 118mm, 5mm wider, and all on the drive side.
In 1978, Campagnolo widened all their spindles by 2.5mm to accommodate the changes in the FD and cranks mandated by the CPSC. They added 1mm to the left and 1.5mm to the right of all the previous spindle specs. That spec was stamped onto the spindles for the first year or so, then they changed the stampings permanently. That's how you end up at 115.5mm.
Or you could just get the right Record/Super/Nuovo Record BB and not have to spend any time in trial assembly. The titanium are like unicorn horns, and about as expensive. But the steel ones aren't that rare.
A little lucky, maybe. As I previously noted, the original spindle length for Record/Super Record (Italian thread) was 113mm. Which is, as we now know, exactly what he has. Lucky? Perhaps the person who put it in there knew what they were doing. Which is very likely, because this compatibility issue was rather better known back then than it appears to be now.
Ok, for my Masi build I had exactly the correct parts, because the were actually the original parts that it was built with, and it still has those parts. I was trying to illustrate that if one has the correct parts, how well a vintage Campy installation will go together.
Another point, 111 versus 113. The 111 mm sealed BBs from Campy are 1 mm longer on the drive side, but it's not easy to measure. If one spends the much bigger bucks and buys the 111 mm Symmetrical Record, one will have Campagnolo's track BB and it will be exactly symmetrical. I have a track Record, several assymmetrical 111s, and a 115.5. If the desired 113 spindle is symmetrical, and it fits the cup holes and bearing races correctly, then the 113 willnot be much different on each side from the 111. Is that really a major mismatch between the two options? As far as mixing in Shimano, not ready to go there. But, I think a 111 mm Asymmetric is worth trying, if it doesn't cost the OP too much.