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Yes! i fitted a CK into my NJS frame, it was the tightest fit ever. Had to sand away the inner race crown for it to fit the fork.
Also tried to put a hatta into a KHS frame, was loose. could pull the headset cups with just my finger.iso n jis is important
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They are ISO. They fit a 30.2 headtube ID, and a 26.4mm crown race seat. When you see EC30 on the skirts, that means 30.2 (ISO).
gubhi
Andrew_DeKerf
@wildwest
As a point of interest these I belive are JIS not ISO I had a lot head scratching last year, get the fork faced correctly.