Re: [CR]ebay outing: Campagnolo wide-ratio derailleur

(Example: Framebuilding:Brazing Technique)

Date: Fri, 11 May 2007 17:55:52 -0700 (PDT)
From: Jerome & Elizabeth Moos <jerrymoos@sbcglobal.net>
Subject: Re: [CR]ebay outing: Campagnolo wide-ratio derailleur
To: yavo <fyavorsky@gmail.com>, chasds@mindspring.com
In-Reply-To: <64c247870705111435k613263f8u839f95b83b0ef985@mail.gmail.com>
cc: classicrendezvous@bikelist.org

That looks almost identical to a later verision of the Rally. BTW, that is NOT a slant parallelogram. It is a horizonal parallelogram like the early 70's Shimano Crane. The difference is, on a horizonal parallelogram, the front and rear plates of the parallelogram lie in a vertical plane. On the patented SunTour design, they lie in a plane "slanted" away from the vertical. By doing this, SunTour was able to make the chain travel in a path more or less parallel to the plane in which the FW teeth lie, therefore maintaining a more constant distance between jocky wheels cage and the FW. The horizonal parallelogram was evidently an attempt to obtain part of the benefit of a slant parallelogram without violating the SunTour patents which were still in force at the time. It worked. That's what a Shimano Crane shifts much better than a Campy NR, but not as well as a SunTour Vx. When the SunTour patents expired, everyone went to slant parallelograms. About the same time they also went to the Simplex-designed sprung upper pivot, which was the reason the better Simplex derailleurs shifted much better than Campy.

Regards,

Jerry Moos Big Spring, TX

yavo <fyavorsky@gmail.com> wrote: That's a Campy Off-Road Record deraileur. I had one on my (since sold) Ouellette "Expedition" bike. More photos of Campagnolo Off-Road group on that bike: http://twistcomm.com/Bikes/Ouellette/Ouellette1.html

Fred Yavorsky

On 5/11/07, chasds@mindspring.com wrote:
> I found this item interesting:
>
> http://ebay.com/<blah>
>
> Is this derailleur essentially the same as the original Rally? Or was it designed after the patent on the Suntour slant-parallelogram expired?
>
> Thanks.
>
> Charles Andrews
> Los Angeles
> _______________________________________________
>

--
Fred Yavorsky
Jenkintown, PA
http://www.twistcomm.com/Bikes