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timmah!
Question on Presta (French) valve sizes?
Was looking at the Japanese Hirame heads and see that alongside Presta (6mm hole) and Woods (5mm) they have something called "Race" (HP-313) with a 4mm hole.
Have not noticed any big difference between my Arays 16B Gold and other classic rims. What are the 4mm race? Not used Soyo Gold Stars but I'd not expect their valves to be much different in diamter from most track tyres. Or is it just a issue of the different kinds of Presta variants? My tubular valves seem to vary from 6mm O.D. threaded or unthreaded down to 5mm-- my Soviet tubular has a kind of indent to 4mm (barbed).