Reverse pull front mtn derailleur?

"Sir Ridesalot" wrote: (clip) Are such derailleurs still made?
^^^^^^^^^^^^^
Were they ever made? I've been waiting for someone else with more authority
to jump in here, but I guess I'll be first. The force on the derailer cage
required to raise the chain is larger than that required to drop it. That
is why the pull direction is always is always the raising direction. The
release direction is accomplished by spring tension--why have a heavy spring
to do a job that can be done without it?

In article <[email hidden]>,

Leo Lichtman () said:

"Sir Ridesalot" wrote: (clip) Are such derailleurs still made?
^^^^^^^^^^^^^
Were they ever made?

Sun Tour used to make them in the 1980's, but I haven't heard of a
modern one.

--
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Leo Lichtman said:

"Sir Ridesalot" wrote: (clip) Are such derailleurs still made?
^^^^^^^^^^^^^
Were they ever made? I've been waiting for someone else with more authority
to jump in here, but I guess I'll be first. The force on the derailer cage
required to raise the chain is larger than that required to drop it. That
is why the pull direction is always is always the raising direction. The
release direction is accomplished by spring tension--why have a heavy spring
to do a job that can be done without it?

Yes the were made by Suntour. They were called Mountech iirc. These
were great if you had to shift the front under load. This happens
frequently where I live.

My buddy just bought a $1000 Cdn DaVinci mountain bike and he too has
trouble getting the front derailleur to shift into the small ring from
the middle ring if the chain is under load.

I have that problem with my Miele mtn bike too. I even tried shifting
while easing up on the force of pedalling. My speed drops off
significantly but the chain just doesn't want to drop off the middle
ring. I'm running a 24 - 34 - 44 setup and the derailleur used to shift
fine.

I still think a reverse action derailleur would be great.

Thanks for any good advice.

"Sir Ridesalot" <[email hidden]> wrote in
news:[email hidden]:

Quoted message said:

Hello there.

I would like to get a reverse action front mountain bike derailleur.
That would be a derailleur where the caged is PULLED to the INSIDE
(inner chainring)by the cable and not to the OUTSIDE (outer chainring)
as is normally done.

The cable to the derailleur will be coming up from under the bottom
bracket.

Are such derailleurs still made?

Cost? and Where can I buy one?

Thank you very much. Peter.

Rivendell still has Suntour Spirt reverse pull fronts, but they're shaped
for double cranks. More importantly, they were only made in 28.6mm clamp
size (most modern seat tubes are 32 or 35mm) and they require housing, so
you'd have to find a clamp-on stop that fits your downtube, too.

But here it is:
http://www.rivbike.com/webalog/shifters_derailleurs/17107.html

Leo Lichtman said:

"Sir Ridesalot" wrote: (clip) Are such derailleurs still made?
^^^^^^^^^^^^^
Were they ever made? I've been waiting for someone else with more authority
to jump in here, but I guess I'll be first. The force on the derailer cage
required to raise the chain is larger than that required to drop it. That
is why the pull direction is always is always the raising direction. The
release direction is accomplished by spring tension--why have a heavy spring
to do a job that can be done without it?

The old Sachs groups, Plasma, Quartz, etc were configured this way if I recall correctly. Maybe you could still find one of those somewhere.
Dan.

Sir Ridesalot said:

Leo Lichtman said:

"Sir Ridesalot" wrote: (clip) Are such derailleurs still made?
^^^^^^^^^^^^^
Were they ever made? I've been waiting for someone else with more authority
to jump in here, but I guess I'll be first. The force on the derailer cage
required to raise the chain is larger than that required to drop it. That
is why the pull direction is always is always the raising direction. The
release direction is accomplished by spring tension--why have a heavy spring
to do a job that can be done without it?

Yes the were made by Suntour. They were called Mountech iirc.

Nope, not Mountech (just checked mine). SL (aluminum cage, worked on
one yesterday) and the Spirt mentioned by another poster, which both
date to the early 70's, are "high-normal," and maybe another model from
the 80's.

Mark

Dave Larrington said:

In article <[email hidden]>,

Leo Lichtman () said:

"Sir Ridesalot" wrote: (clip) Are such derailleurs still made?
^^^^^^^^^^^^^
Were they ever made?

Sun Tour used to make them in the 1980's, but I haven't heard of a
modern one.

I found one on a curb/garbage bike. It was on a schwinn high sierra.
I expect early 80's, bolt on wheels, suntour power thumb shifters. the
derailleur has markings on it

MEADA IND JAPAN VIA(logo) CC

, but it is a bottom pull without the need for a cable stop.
it also is a triple, but weird, 48, 46. 24 shimano bio pace.

Mark Janeba said:

Sir Ridesalot said:

Leo Lichtman said:

"Sir Ridesalot" wrote: (clip) Are such derailleurs still made?
^^^^^^^^^^^^^
Were they ever made? I've been waiting for someone else with more
authority
to jump in here, but I guess I'll be first. The force on the
derailer cage
required to raise the chain is larger than that required to drop it.
That
is why the pull direction is always is always the raising direction.
The
release direction is accomplished by spring tension--why have a heavy
spring
to do a job that can be done without it?

Yes the were made by Suntour. They were called Mountech iirc.

Nope, not Mountech (just checked mine). SL (aluminum cage, worked on
one yesterday) and the Spirt mentioned by another poster, which both
date to the early 70's, are "high-normal," and maybe another model from
the 80's.

It was in the XC lineup around 1986-7. One came on my Bridgestone MB-1,
nightmare idea. If it won't shift from the middle to the small from the
spring pressure of a regular shifter, than using thumb pressure is
mostly going to cause chainsuck. And with even the slightest bit of
gunk spring pressure wasn't strong enough to shift from the middle ring
to the large.

Greg

--
"All my time I spent in heaven
Revelries of dance and wine
Waking to the sound of laughter
Up I'd rise and kiss the sky" - The Mekons