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J.I.S. One Inch Threaded Headsets

The J.I.S. (Japanese Industrial Standard) size was used on older Japanese and other Asian bikes, most commonly less expensive models.
Later, higher-priced Asian bikes use the ISO size.
Cup outside diameterCrown race inside diameterThread sizeStem diameter
30.0 mm
(Current models are 30.2 mm)
27.0 mm 1" x 24 tpi7/8" / 22.2 mm
NOTE: The Tange headset is NOT "Full JIS". They have 30.2mm cups.
We've sold hundreds of the Tange headsets over the years and have not heard of any problems when installing the 30.2mm cups into 30.0mm I.D. headtubes.
Levin headset

Tange Levin CDS HD1002 buy button

Excellent value in a steel headset, using 5/32" ball bearings.

Stack height: 33.4 mm

Weight: 149 grams
Crown Race: 27.0mm
Cups: 30.2mm


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