Re: [CR]DeMultiplicators and DuoPars.

Example: Production Builders:Peugeot:PY-10

Date: Sat, 30 Jun 2007 11:00:17 -0700 (PDT)
From: Fred Rednor <>
Subject: Re: [CR]DeMultiplicators and DuoPars.
In-Reply-To: <>

     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)

--- Harvey Sachs wrote:

> Randy Dugan responded to Charles Andrews:


\r?\n> Not to hijack your shout-out to Charles, but I have an

\r?\n> Eco-Duopar and a

\r?\n> 14-34 Ultra 7, running 46/34 up front with a cheap KMS chain

\r?\n> on a 1980

\r?\n> Schwinn Voyageur 11.8 city bike conversion. Works great

\r?\n> range-wise, but

\r?\n> it can be tough to shift just one cog at a time. This might

\r?\n> have to do

\r?\n> with the Sun tour ratchet stem shifters, which have a large

\r?\n> drum.

\r?\n> Haven't tried with any other shifters.

\r?\n> +++++++++++++++++++++++++++++++++++++


\r?\n> Simplex "DeMultiplicators" are available from lots of folks,

\r?\n> and help

\r?\n> solve this problem. Basically, it is a lever that installs on

\r?\n> the

\r?\n> down-tube, and roughly doubles the amount of lever travel

\r?\n> required for a

\r?\n> given movement of the rear derailleur. I'm using one with a

\r?\n> "Crane" RD

\r?\n> and Shimano bar-ends, and it does help "unstack" the shift

\r?\n> positions.


\r?\n> One is shown, top view, as eBay item 7180033273. More

\r?\n> commonly, I've

\r?\n> seen them without the plastic guide on the left side. You may

\r?\n> have a bit

\r?\n> of trouble fitting the cable that runs from the

\r?\n> demultiplicator to the

\r?\n> RD, it is a very small barrel head (as I recall it).


\r?\n> harvey sachs

\r?\n> mcLean va.