Track Cog Threading

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ISO Track cogs are threaded 1.375" x 24 tpi, Just like a bottom bracket. threads should be at about 7mm long.

ISO Track lockrings are threaded 1.29" x 24 tpi LH, a left handed thread.

exeptions:
campy lockrings are 1.32" x 24 tpi LH

French is 33mm x 1mm LH