triple derailleur

[Tburtim]

I have a Sora rear deraileur and a 28t cog on cassette. The top pulley contacts the cassette when I
shift to the 24t and the 28t cogs. I tried shortening the chain and maxed out the set screw on the
derailleur tab. I really need a granny gear. The set up is on a 2001 Trek 1000 road bike with STI
levers. Would it help if I went to a mountain bike derailleur like a XT or does one of the other
road derailleur have more teeth capacity. My bike shop owner says that those extreme shifts ( little
ring in front X big cog in back) just are not made to work??? Thanks for any advice

 

[Qui Si Parla Ca]

TBurtim-<< I have a Sora rear deraileur and a 28t cog on cassette. The top pulley contacts the
cassette when I shift to the 24t and the 28t cogs. I tried shortening the chain and maxed out the
set screw on the derailleur tab.

<< Would it help if I went to a mountain bike derailleur like a XT or does one of the other road
derailleur have more teeth capacity.

Yep, that'll do it....a longer cage, with appropriate chain length will get the top pulley outta the
way of the big cogs...

<< My bike shop owner says that those extreme shifts ( little ring in front X big cog in back) just
are not made to work???

Not true, a MTB rear der will allow it to work.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene"

 

[Sheldon Brown]

TBurtim wrote:
> I have a Sora rear deraileur and a 28t cog on cassette. The top pulley contacts the cassette when
> I shift to the 24t and the 28t cogs. I tried shortening the chain and maxed out the set screw on
> the derailleur tab. I really need a granny gear. The set up is on a 2001 Trek 1000 road bike with
> STI levers. Would it help if I went to a mountain bike derailleur like a XT or does one of the
> other road derailleur have more teeth capacity.

That really _should_ work. I rarely recommend derailer replacement as a cure for shift problems, but
in this case I would. The Sora is my least favorite Shimano rear derailer (though I'm quite partial
to the rest of the Sora group.)

Don't get hung up over the marketing terms "mountain" vs "road" derailers.

20 years ago wide range derailers were called "touring" equipment, but then the marketeers
determinet that "touring" had run its course as a marketing buzzword, and re-christened them
"mountain" products.

An XT would be an excellent choice for you, or, if money is a bit tight, an LX or Deore would also
be just dandy.

> My bike shop owner says that those extreme shifts ( little ring in front X big cog in back) just
> are not made to work???

Your bike-shop owner is replete with used food, if he or she really said that!

Sheldon "Putting It Delicately" Brown
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[Chris Zacho "Th]

IMHO, Hyperglitch-er-glide _itself_ was designed to prevent customised gearing from working. It
certainly doesn't shift any faster (than Unigiide) in my experience.

But that's JMO.

May you have the wind at your back. And a really low gear for the hills! Chris

Chris'Z Corner "The Website for the Common Bicyclist": http://www.geocities.com/czcorner

 

[Qui Si Parla Ca]

Capt-<< Your bike-shop owner is replete with used food, if he or she really said that!

Have to remember this one-very good!!!

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene"