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Old January 4th 18, 01:26 AM posted to rec.bicycles.tech
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Default Valve core thread dimensions

Schrader valve

External thread: 5/16x32 fine thread

Internal thread: 0.209 in OD x 36 TPI

Presta valve

The valve threads for Presta valves follow the ISO 4570 standard.[4][5]Â*The external threads at the tip of both "threaded" and "unthreaded" Presta valves are 5V2, which measures out to 5.2×1.058Â*mm.[6]Â*The external threads on the main body of "threaded" Presta valves are 6V1, which measures 6×0.80
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