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@gbj_tester
The full JIS spec also has 30.0mm cups, not the 30.2mm ISO, just to make things even more annoying, so if your frame has 30.2mm bores in the head tube you won't be able to use a JIS headset, but a full JIS spec 30.0/27.0 frame and fork can be recut to full ISO spec 30.2/26.4