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/
Fred Yavorsky
On 5/11/07, chasds@mindspring.com wrote:
> I found this item interesting:
>
> http://ebay.com/
>
> 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/