My 2001 Raleigh R300 Tourer had a 1" Tange headset that went bad "brunnelling". I bought a 1" threaded nashbar headset with sealed cartridges (I will assume it is ISO). The cups pressed right in to the head tube with no problems, but I fought for a good 20-30 minutes trying to get the crown race on the fork with PVC pipe and have now concluded that it is a JIS 27.0 width. I think I ruined the new crown race. I put the old crown race back on (with the pvc pipe) and 2 good hits with the hammer, so I have concluded that the new race is 26.4 ISO.
(1) I assumed from reading the forums that the JIS was an old standard going back to the 80s and that everything since the mid-90s is ISO.
(2) Can I use my old race with the new sealed cartridge ? The sealed cartridge fits on the race and feels fine. Since the ball bearings are sealed and won't come in direct contact with the race, I think it will work.
Any Help would be appreciated.