Re: [CR]Question: BB fixed cup

(Example: Framebuilding:Norris Lockley)

Date: Thu, 12 Jan 2006 13:10:11 -0600
From: "John Thompson" <JohnThompson@new.rr.com>
Organization: The Crimson Permanent Assurance
To: Bianca Pratorius <biankita@earthlink.net>
Subject: Re: [CR]Question: BB fixed cup
References: <2dfed2ce3ffb50c91e094e030e3a31e2@earthlink.net>
In-Reply-To: <2dfed2ce3ffb50c91e094e030e3a31e2@earthlink.net>
cc: classicrendezvous@bikelist.org

Bianca Pratorius wrote:
> Item: 70mm shell Bianchi bb.... Frame made in Italy mid 80's Columbus
> tubing
> I need to remove the fixed cup. This must be a common problem. I don't
> want to muck up the threads, but I have no way of knowing which way to
> turn the fixed cup. You can't see in there to determine which way the
> threads are running. If I make a mistake I will have damaged the frame.
> Which way should I remove the fixed cup....Normal counterclockwise or
> clockwise?

My guess would be that it is Italian thread and thus "normal" on both the fixed and adjustable cup sides. Are there any markings to suggest threading? Italian is 36x24F; English is 1.370x24tpi. If there are no obvious markings, remove the adjustable cup and see if a known English thread cup fits. If the frame has Italian threading, the English cup won't engage the threads.

--

-John Thompson (john@os2.dhs.org)
Appleton WI USA