Re: [CR]Frame Alignment Obsession?

(Example: Events:Cirque du Cyclisme:2007)

From: "J.Dunn" <bikehunter@icehouse.net>
To: <feldmanbike@YAHOO.COM>, "Richard M Sachs" <richardsachs@juno.com>
Cc: <jschaer@columbus.rr.com>, <rabbitman@mindspring.com>, <classicrendezvous@bikelist.org>
References: <20011219.120401.-159119.3.richardsachs@juno.com>
Subject: Re: [CR]Frame Alignment Obsession?
Date: Wed, 19 Dec 2001 10:43:59 -0900


Maybe he could cut it down the center and see if the pieces match. ;-)

John Dunn in Boise


----- Original Message -----
From: Richard M Sachs
To: feldmanbike@YAHOO.COM
Cc: jschaer@columbus.rr.com


<classicrendezvous@bikelist.org> Sent: Wednesday, December 19, 2001 8:03 AM Subject: Re: [CR]Frame Alignment Obsession?


> imperfection is perfection
> e-RICHIE
> in chester
>
>
>
>
> On Wed, 19 Dec 2001 08:35:46 -0800 "feldman" <feldmanbike@yahoo.com>
> writes:
> > I'd find it interesting to take a measurement survey across a variety
> > of
> > frames, vintage and modern and all materials.
> > The errors measurable might be surprising.
> >
> > David Feldman
> > Vancouver WA
> > ----- Original Message -----
> > From: "Jon M. Schaer" <jschaer@columbus.rr.com>
> > To: "garth libre" <rabbitman@mindspring.com>;
> > <classicrendezvous@bikelist.org>
> > Sent: Tuesday, December 18, 2001 10:09 PM
> > Subject: Re: [CR]Frame Alignment Obsession?
> >
> >
> > > ----- Original Message -----
> > > >>>
> > > When I got home and put the wheel on frame it still was a shade
> > off from
> > > having the rear wheel centered under the brake bolt of the bridge.
> > It is a
> > > shade over 1 mm off. Others can not see it, as 1 mm is such a
> > small
> > > difference. Finally I just took a ruler and measured the distance
> > from the
> > > center of the braze on bolt holder to the inside face of the seat
> > stays
> > and
> > > there was the 1 mm difference.
> > > >>>
> > >
> > > By that description it sure sounds like the bridge is off. It is
> > possible
> > > that, though the hole is not centered between the seat stays, that
> > it is
> > on
> > > the center plane of the frame. But in this case, the wheel would
> > probably
> > > look correct at the hole, but closer to one seat stay. This
> > condition
> > could
> > > be checked on a frame table, or with a surface gauge and some
> > long
> > > indicators, off of the BB shell faces.
> > >
> > > Either way, I honestly would not hassle over a 1mm vertical lean
> > error. I
> > > would use no-hands riding as the guidepost. You can detect pretty
> > subtle
> > > errors, but it depends on where the error is, and rear wheel lean
> > doesn't
> > > stand out much. I've seen more error than that on many big-name
> > carbon
> > > forks, and the owners couldn't even tell.
> > >
> > > Jon Schaer
> > > Columbus, OH
> > >
> > > _______________________________________________
> >
> >
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