Originally Posted by
SkyDog75
Kontact subtly touched on that in the second post when he pointed out that the OP should be looking for an ISO spindle for his Super Record crankset. The OP's Campy cranks are made for an ISO-tapered bottom bracket spindle. Shimano cranks and bottom brackets use JIS.
Incorrect. Please see my previous post.
Originally Posted by
SkyDog75
The taper angle is the same, but ISO spindles are a bit skinnier at the end.
This much is true. JIS tapers tend to be longer too. ISO mandates a length to the taper, JIS does not.
Originally Posted by
SkyDog75
It
is possible to mix and match somewhat, but you need to be aware of the fitment considerations to compensate. Sheldon Brown's site, linked below, touches on that.
https://www.sheldonbrown.com/bbtaper.html
This, frankly, is where St. Sheldon lets you down. JIS and ISO have only existed since about 1991, so literally everything made before then is not, I repeat, NOT JIS or ISO. ISO at least was a compromise taper that would work decently well with everything from Campagnolo to Stronglight to Zeus. (Unfortunately, this left Ofmega out in the cold.)
JIS basically standardized the Maxy-type spindle that was already the
de facto Japanese standard, but with some exceptions that remained, and still do.
The world of BB tapers is much more complicated than ISO and JIS. Please remember that when talking about practically anything C&V.