o i see, it's the adjustable pivot position that threw me off i'd forgotten about that !
On Jan 28, 2008 6:58 PM, Jeremy Rauch <classic2@cadre.org> wrote:
> The 851 and 801 are identical -- the only part numbers that differ are
> those of the 2 parallelogram arms. The 851 arms are anodized, while
> the 801's are not.
>
> For the OP: the stop you have is probably not original -- thats the
> stop issued with the 800 derailleur. The 801 and 851 would have the
> pressed steel version. However, the (basic) design of the 800, 801
> and the 851 is the same, so the stop you have should work correctly.
>
> From what I can tell, the 800/801/851 designed lasted from
> 1978-1989. Quite the run, given what else was available.
>
> The 840 is a great, Shimano-geometry compatible derailleur, thats a
> good 7 years after the list cutoff date, so I'll say no more -- but I
> will HIGHLY recommend Chuck Schmidt's Mavic catalog reprints.
> Indispensable resource if you're a Mavic fan.
>
> Jeremy Rauch
> Brooklyn, NY