I just bought a Superbe track BB, spindle 70-S. The ends are 12.6 mm broad, measured about 1.5 mm from the end. This is exactly what a Campy Record road spindle from the mid-80s (68-SS) measures. A JIS spindle I have is slightly larger at the same point, 12.7 mm (an even half inch). I think that's what the JIS standard is, while ISO is 12.5, and Campy is in between them, with Superbe, I'm inclined to believe.
So, I think that SunTour's unique taper may be baloney, unless the angle of the taper is different than the standard 2 degrees, which as far as I can tell from measuring, it is not.
Last edited by Charles Wahl; 10-30-08 at 07:50 PM.