Front Derailleur problems (chain falls off inside)

I have an older style Durace crankset and front double derailleur. I
used the 9speed upgrade and everything works pretty well. However,
sometimes when I'm pedalling hard, the rear cog is the 4th biggest
gear and I change the front from the big to small, the chain falls
off.

I set the inner stop as far as possible without chain rub on the
smallest gear settings but it still falls off. I put the fr.
derailleur as low as it can go and still clearing the front teeth.

It only happens sometimes but it's quite annoying because I'm usually
climbing a hill and I can't keep pedalling so sometimes tip over as I
try to unlock my cleats.

Any other ideas for adjustments? Should I replace the front
derailleur with a new 9 speed derailleur or are they the same? I'm
thinking I should buy a 3rd eye chain watcher but not sure where to
get one close to Palo Alto, CA.

Please just post to the newsgroup for everyone to benefit. Thanks.

Post To Newsgro wrote:
I have an older style Durace crankset and front double derailleur. I
used the 9speed upgrade and everything works pretty well. However,
sometimes when I'm pedalling hard, the rear cog is the 4th biggest gear
and I change the front from the big to small, the chain falls off.
I set the inner stop as far as possible without chain rub on the
smallest gear settings but it still falls off. I put the fr. derailleur
as low as it can go and still clearing the front teeth.
It only happens sometimes but it's quite annoying because I'm usually
climbing a hill and I can't keep pedalling so sometimes tip over as I
try to unlock my cleats.
Any other ideas for adjustments? Should I replace the front derailleur
with a new 9 speed derailleur or are they the same? I'm thinking I
should buy a 3rd eye chain watcher but not sure where to get one close
to Palo Alto, CA.
Please just post to the newsgroup for everyone to benefit. Thanks.



I have an 8-speed crank and when I put a 9-speed chain on one time it
would throw off the inside on almost every front downshift. No amount of
futzing with the derailleur helped. Changing back to an 8-speed chain
solved the problem instantly.

I think you need a 9-speed crank to go with the rest of your upgrade.



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