Thread: JIS Quill stem in 1inch ISO threaded headset
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Old 05-11-10, 09:48 PM
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Dan Burkhart 
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The headtube ID is ever so slightly different as well. ISO is 30.2mm, JIS 30.0. Close enough that they can be made to interchange. You can also buy headsets that fit ISO frame to JIS fork and vice versa.
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