[INDENT] ISO square taper spindles run longer, and taper down to a smaller end than J.I.S. spindles do. Most European-made square taper cranks and bottom brackets use the ISO dimensions. ISO models include:
(Note: Old Ofmega/Avocet spindles were quite a bit skinnier/longer even than ISO. There are no modern bottom brackets that work with old Ofmega/Avocet cranks.)
J.I.S. is the Japanese Industrial Standard, and is generally used on square taper cranks made in Asia. J.I.S. spindles are shorter and blunter, they don't taper down to quite as small a square. J.I.S. models include:
Ritchey
S.R. Sakae Ringyo
Shimano
Specialized
Sugino (except N.J.S. track models and some older units.)
**ISO **
[INDENT] ISO square taper spindles run longer, and taper down to a smaller end than J.I.S. spindles do. Most European-made square taper cranks and bottom brackets use the ISO dimensions. ISO models include:
[/INDENT] **J.I.S. **
J.I.S. is the Japanese Industrial Standard, and is generally used on square taper cranks made in Asia. J.I.S. spindles are shorter and blunter, they don't taper down to quite as small a square. J.I.S. models include: