ISO threading is essentially the same as English. The ISO some years ago sanctified the English standard by adopting it as the "official" international standard for bicycle threading. Technically this was a bizarre decision, since as early as the mid-50's, most international technical organizations were pronouncing the English system of measurement in general to be archaic and obsolete, and predicting its imminent replacement with the metric (now referred to as SI) system. But the ISO decision was all about economics and market power. By that time the Japanese component makers, especially Shimano, had become huge players in the market, and they had gone primarily to English threading since the US was their biggest market. So the ISO bowed to this reality, and adopted a standard which they or their predecessors had been decrying as obsolete for decades. I had thought that the ISO standard was adopted more recently than 1985, but time flies, I guess.
Regards,
Jerry Moos Houston, TX
Raymond Dobbins <raydobbins2003@yahoo.com> wrote: hi all,
i have a 1985 6 speed regina oro freewheel nib. the freewheel does not indicate what the threading is, but the box is marked "ISO." for some reason i thought this meant the threading was english - is this correct? if ISO has nothing to do with the threading, how can i know what the threading is?
thanks in advance for your help,
ray dobbins
miami, florida