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In West Newton Since 1952 - On The Web Since 1995

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ISO One Inch Threaded Headsets

This is the size used on most high quality bicycles manufactured before the late 1990s.
See also Sheldon Brown's Headset Crib Sheet

ISO Standard Dimensions:

Cup outside diameterCrown race inside diameterThread sizeStem diameter
30.2 mm 26.4 1" x 24 tpi7/8" / 22.2 mm



HD1001

Tange Levin ISO HD1001 buy button

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

Stack height: 33.4 mm Weight: 149 grams






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