Originally Posted by bigbossman
Yeah - the BMZ frame. Ok, so all my Japanese headsets are JIS then. FWIW, the top threaded caps screw on fine to the fork, so the fork threads don't seem to be different - just the crown race.
A quick Google reveals that ISO headserts are pretty common, indeed. I'd like to know if I can use the ISO races with the JIS cups, mainly because I have a "special" JIS headset with sentimental value that I'd really, really like to use.....
Yes the cups *generally* will not be a fit issue on a swapped-in crownrace, though there are occasional misfits. Look at biketoolsetc.com, they sell single spare crown races for (mostly) Tange HS in both 27 and 26.4.