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<div class='quotetop'>Цитата</div>
Two major styles of square taper bottom brackets are:

1. Japanese International Standard "JIS" (Shimano compatible)
2. International Organization for Standardization "ISO" (Campy)

While both use a 2 degree taper, the Campy (ISO) spindle starts and finishes smaller than a Shimano (JIS). Therefore, the JIS and ISO bottom brackets are not compatible with each other and must be matched with a compatible crank.[/b]
Взято отсюда: http://www.bikeman.com/content/view/1599/115/1/1/