Originally Posted by
HillRider
There are a number of "mixed dimension" headsets available for those who have JIS frames but purchase an ISO fork or have a JIS fork milled to an ISO crown race seat diameter. My '85 Bridgestone 400 required on of those when the fork was modified.
Do you know where you can buy a mixed dimension headset? I went to two bike shops in town. Neither one had the tools or the expertise to mill the headtube to 30.2. I think that this would be the best long-term solution as then the bike would have the ISO standard.
The other possibility is to simply buy two identical velo-orange headsets, one JIS, the other ISO, and use the 26.4 crown race from the ISO headset and the 30.0 cups from the JIS. That is a bit pricey but it will work.
It is an old school custom build US bike and I want to get it working again:
