Re: [CR]Why is the Italian threading standard weird.?

(Example: Framebuilders:Alex Singer)

Date: Sat, 26 Aug 2006 09:54:59 -0400
To: classicrendezvous@bikelist.org
From: "John Betmanis" <johnb@oxford.net>
Subject: Re: [CR]Why is the Italian threading standard weird.?
In-Reply-To: <20060826133620.14642.qmail@web30612.mail.mud.yahoo.com>
References: <44F03F95.9020303@cox.net>


At 06:36 AM 8/26/06 -0700, Fred Rafael Rednor wrote:
> I don't know the answer, but it isn't limited to Bottom
>Bracket threading. Italian headsets are 25.4mm with 24 TPI
>(well that one makes sense, as 25.4mm = 1 inch); and the axles
>are threaded at 26 TPI, although the diameters are typically
>9mm and 10 mm.

It looks like they started making components on lathes with English gears and lead screws and continued to do so.

John Betmanis <johnb@oxford.net>
Woodstock, ON Canada