Originally Posted by
Bob Barker
The cups @ 30.2mm (vs 30.0) would make it ISO, and the crown race at 27.0 is JIS. I actually have seen these "hybrid" ISO/JIS headsets available this way, IIRC from Tange (maybe Ritchey)
I understand the difference betweeen ISO and JIS. But some are "mixed," like on my Centurion. Even if you can't find a headset that comes that way, 27.0 crown races are readily available-