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French fork by any chance?
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There were a few standards floating about. French is the only one I've encountered (outside of the essentially interchangeable Italian).
Sheldon, as ever : https://sheldonbrown.com/cribsheet-headsets.html
Velo Orange sell a French threaded headset if it is that.
withered_preacher
DayTripper_Mk2
@Zebra
Was there ever a different thread standard for 1" forks?
I bought a fork a few months ago that I believe to be from the 60s. I was just trying it out now on a random frame and I noticed the headset won't thread at all. The threads look perfectly fine and clean. What is happening here?