Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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You have a standard ISO crown, nominally 26.4, but actually 26.45 to create interference. Unless you're in Japan where JIS (27.0) headsets are more common, you should have no problem finding the correct 1" headset. If you're totally unable to fine one, PM me as I have a bunch of new old stock 1" threaded headsets, and can take care of this for you.
BTW- take a moment to also measure the ID of the headtube, which should be 30.2mm or a bit under. Measure it in 2 directions in case it's slightly oval and average both for the true size.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance