Re: [CR]Old Campy hubs

(Example: Framebuilding:Tubing)

From: "Mark Petry" <mpetry@bainbridgeisland.net>
To: "Jerry Moos" <moos@penn.com>, <Wdgadd@aol.com>, "Classic Rendezvous" <Classicrendezvous@bikelist.org>
References: <7f.113a4841.27da5e9b@aol.com> <3AA90822.34B6CA5F@penn.com>
Subject: Re: [CR]Old Campy hubs
Date: Fri, 9 Mar 2001 08:55:09 -0800


This was discussed long ago in the "old" rendezvous, the legacy of TPI stems from the retooling of post WW2 europe with machine tools made in the USA. Even tho it was possible to turn parts to metric diameters, the lead screws on lathes kept much of the bicycle industry locked into english pitch when threading parts.

Mark "nothing wrong with 55 degrees" Petry


----- Original Message -----
From: Jerry Moos
To: Wdgadd@aol.com
Sent: Friday, March 09, 2001 8:43 AM
Subject: Re: [CR]Old Campy hubs



> 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.
>
> Regards,
>
> Jerry Moos
>
> Wdgadd@aol.com wrote:
>
> > 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?
> >
> > Regards,
> > Wes Gadd