I think all English and Italian thread dimensions, at least back to the 60's and perhaps much earlier, always expressed the thread pitch in TPI. French and Swiss thread pitch, so far as I know, were always expressed in mm. I doesn't seem to matter who the manufacturer was, only which threading standard the component used. I don't know how or when the Italians came to use a hybrid spec including TPI.
> I've been wondering how this odd mixed system evolved. The diameter is a
> metric dimension (9 or 10 mm) yet the number of pitches is in a now obsolete
> British dimension (British Standard Cycle). I know Zeus used this system; did
> other non-Japanese Campy clones? Do current Campy hubs still use this, or
> have they standardized to a straight metric/ISO for axles and cones?
> Wes Gadd