Originally Posted by
TugaDude
There is a chance that it is a proprietary thread or perhaps Italian. British and ISO are virtually identical, so that isn't the problem.
It won’t be Italian, either. The difference between Italian and English or ISO is very small, and an Italian cog is a B fit on an English hub. Specifically, the thread diameters for the different standards are as follows:
English - 1.370” (34.8mm)
ISO - 1.375” (34.92mm)
Italian - 1.378” (35mm)
The thread pitch is 24 TPI for all three.
Ref. Southerland’s Handbook for Bicycle Mechanics, Third Edition.
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