Thread: Dumb Question: Threaded Fork Headset Crowns
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Old 10-09-11 | 07:34 PM
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JohnDThompson
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From: Appleton WI

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If it's not a Japanese headset part, it's highly unlikely to be JIS diameter.

Unfortunately, if it is a Japanese headset part, it could be either JIS or ISO. You won't know until you remove the race and directly measure the seat diameter.

The good news is that it is trivial to mill JIS crown race seats to accept ISO headsets.
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