Harvey,
I wonder if it isn't the chain? Not becasue it's cheap -
but becaue it's a flexible modern chain... I found that
Duopars needed the stiffest chain possible. In 1980, you could
find those in every corner bike shope and hardware store, but
today it requires some real research and a bit of begging.
Fred Rednor - Arlington, Virginia (USA)
> Randy Dugan responded to Charles Andrews:
>
> Not to hijack your shout-out to Charles, but I have an
> Eco-Duopar and a
> 14-34 Ultra 7, running 46/34 up front with a cheap KMS chain
> on a 1980
> Schwinn Voyageur 11.8 city bike conversion. Works great
> range-wise, but
> it can be tough to shift just one cog at a time. This might
> have to do
> with the Sun tour ratchet stem shifters, which have a large
> drum.
> Haven't tried with any other shifters.
> +++++++++++++++++++++++++++++++++++++
>
> Simplex "DeMultiplicators" are available from lots of folks,
> and help
> solve this problem. Basically, it is a lever that installs on
> the
> down-tube, and roughly doubles the amount of lever travel
> required for a
> given movement of the rear derailleur. I'm using one with a
> "Crane" RD
> and Shimano bar-ends, and it does help "unstack" the shift
> positions.
>
> One is shown, top view, as eBay item 7180033273. More
> commonly, I've
> seen them without the plastic guide on the left side. You may
> have a bit
> of trouble fitting the cable that runs from the
> demultiplicator to the
> RD, it is a very small barrel head (as I recall it).
>
> harvey sachs
> mcLean va.
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