Join Date: Nov 2004
Location: Appleton WI
Bikes: Several, mostly not name brands.
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 427 Post(s)
Ok, is the fork set up for a JIS race (27.0mm) or ISO race (26.4mm)? If it's a steel fork, it's trivial to mill a JIS race seat down to ISO size; then you can use any ISO headset. It's harder going the other way (mounting a JIS race on an ISO fork race seat). You either have to build up the race seat with brass and re-mill it to JIS, or use a knurling tool to expand the ISO race seat to hold the JIS race. The first method is preferable, if you have a choice.
Otherwise, some headsets were made in both JIS and ISO dimensions; buy one of each and mix 'n' match to make it work.