Yes, thank you. Very helpful to me. And, I fully understand you are scoping design limits to assist in shaping on-topic/in-time line gearing. No one wishes otherwise.
Me - what a dunce: gold under my nose and I didn't even recognise it. Looks like that Duopar Eco is just the ticket for TA Cyclotouriste 3-ring w/5p or 6p cogs.
Incidentally, I have potentailly two versions of Duopar Eco. I will post observed differences later. A long time ago, I acquired a "grab bag o' stuff" that included these two rear mechs. I may make wind chimes from the other items.
Richard Cielec Chicago, Illinois
email@example.com wrote: Rich and Don,
My comments are veering seriously off-topic, but I hope well-useful to Rick. The Huret I have that is working really well is a Duopar Eco. According to Berto it has a little smaller range than the Duopar. I also have Duopar Ti not yet in use. The DuoEco is on my Trek 610, shifting an off-topic Shimano Megarange 7 13/34 with 52/40 up front. I also have a modern Campy Racing T shifting a 52/42/30 with a 13/26 Sachs 7 on my Woodrup. It also shift very well, but with a little more overshift than the Duo. However, the Racing T has some sprocket and wrap-up limitations (it's maxed out in the setup above) that the DuoPar easily transcends. Perhaps someone can build a modern rear mech using the vertical parallellogram principle.
Ann Arbor, MI
-------------- Original message -------------- From: r cielec <firstname.lastname@example.org>
> Don, et al:
> A learning curve of formidable amplitude is on my screen it seems. Thank you
> for the correction.
> To clarify: My fuzzy recollection was version/versions of Duopar were not
> quite up to the bench mark performance established by the Duopar name and, that
> the Eco version was an underacheiver. So, 'tis a relief to be relieved of my
> misconception and simultaneously informed that I have the very mech. needed.
> Richard Cielec
> Chicago, Illinois
> Donald Gillies wrote:
> I am surprised that you do not think much of the huret duopar (either the
> eco steel model or the titanium model.) Frank Berto, who i s a hero of mine,
> considers this to be the best-shifting derailleur of the early 1980's
> (better than Suntour VGT, although not as light as Suntour Cyclone, which
> are two of his other favorites.)
> The super-weird SLJ derailleur on the header page of french components
> is probably the strangest thing i've ever seen from simplex :
> I have never seen it in a catalogue. I have several used SX-410's
> (low-mid end, some with S starbursts like SLJ but not SLJ) with long
> cages, please write to me if you are interested in one ($18).
> - Don Gillies
> San Diego, CA