We've all seen this concerning square taper standards:
Originally Posted by Sheldon Brown
J.I.S. models include:
- Ritchey
- S.R. Sakae Ringyo
- Shimano (except older Dura-Ace)
- Specialized
- Sugino (except N.J.S. track models and some older units.)
ISO models include:
- Campagnolo
- Older Stronglight
- Nervar
- TA
- Japanese N.J.S. track parts, such as Sugino 75
The above section could be more clear if it simply read that
Campagnolo switched to ISO around 1994. And new cartridge bb's with the JIS taper actually offer the better fit for vintage Campagnolo cranksets over their ISO counterparts.