All
well, from personal experience, I DID have an Italian threaded fixed cup loosen while on a ride. (Bike was a 1980 Gios)
Of course I was not carrying the appropriate wrench so I had to stop several times to hand tighten it before I finished riding. It seemed that no significant damage to the BB occurred.
Ken Sanford
Kensington, MD
> From: onetenth@earthlink.net
> To: johnb@oxford.net; classicrendezvous@bikelist.org; dtshifter@aol.com
> Date: Wed, 9 Feb 2011 14:21:38 -0500
> Subject: Re: [CR] RH (clockwise) BB Cups.....was Legnano BB Wuestion
>
> I don't have photos but I've seen a lot of loosened drive side cups over the
> years. Most have been LH threaded British fit ones, but given the vast
> number more of low cost assembly Asian bikes that have been on my repair
> stand that's no surprise. Back in the day I/we did see many more French
> threaded cups that came loose. This is why I had thought Motobecane went to
> Swiss spec shells at one point (to get the LH drive side thread direction).
> Interestingly the number of Itl. threaded cups that I've seen loose is very
> small. Again probably due to the few low cost Itl. bikes seen here in the
> USA.
>
> I always attributed the chance of cups loosening up more to the assembly
> torque and not the thread direction, epicyclical forces not withstanding.
> Andy
>
> ----- Original Message -----
> From: <dtshifter@aol.com>
> To: <johnb@oxford.net>; <classicrendezvous@bikelist.org>
> Sent: Wednesday, February 09, 2011 1:05 PM
> Subject: [CR] RH (clockwise) BB Cups.....was Legnano BB Wuestion
>
>
> > In ~40 years of riding and working on bicycles, I cannot remember either
> > an Italian or French bottom bracket fixed cup (RH) which had loosened!!
> > In fact, as many of you can attest, many French threaded fixed cups seem
> > to be somewhat "immune" to the removal process!!
> >
> > Is this actually a problem??
> >
> > Chuck Brooks
> > Malta, NY NEUSA
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> >
> >
> > _______________________________________________
> Andrew R Stewart
> Rochester, NY