I've seen that scan as well, and did a bunch of digging to try to find out if the 10-pitch road stuff was ever produced. As far as I can tell the road group was vaporware; I haven't been able to find anyone who's ever seen a single piece of it.
Galen "likes his 10-pitch track group" Pewtherer San Francisco, California, USA
On Tue, Mar 18, 2008 at 9:35 PM, devotion finesse
<devotion_finesse@hotmail.com> wrote:
>
> I have been reading with great interest a discussion on anothery cycling fo
> rum regarding the Dura-Ace 10-Pitch drive train produced briefly in the lat
> e 70's.
> I have only ever seen a track/keirin version.
> Yet a fellow NYC CR fellow who happens to have a bit of a "thing" for vinta
> ge Japanese track bikes has posted a 1976 catalog image which states: "Dura
> -Ace 10 Road System Components Ensemble will be introduced in 1977".
> Does anyone know if either prototype or production versions of the road gro
> up exist? Do you own one? Can you share pictures?
>
> Matthew "trying unsuccessfully to avoid a new bike part obsession" Bowne
> Brooklyn, New York
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--
-galen