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Sora chain ring "dropping off" going from large to small ring?



 
 
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Old September 6th 04, 11:36 AM
Yuri Budilov
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Default Sora chain ring "dropping off" going from large to small ring?

Hello everyone

I have a 2004 Trek 1000 road bike, with about 1700 km on the close, which
has Shimano Sora group set - double chain ring. Generally I am happy with
the bike given its low price anyhow....

Lately, when I change from large chain ring to small one the chain simply
drops off (every 3rd-4th change).
Once it even did so when going from small to large chain ring.

I wonder if anyone can shed some light on this? My LBS checked it and in
test could not fault it. The only advice they could offer me was to change a
few rear cogs up/down so that the chain is more or less "straight" when I am
about to change from small to large chain ring or vice versa. I have been
trying this and it certainly does help somewhat but I can not help thinking
this is all rather odd.

Is this as good as it gets with Sora? Is there anything else that can be
done/adjusted? The LBS did adjust the chain and pronounced it good.

Will a 105 or Ultegra group set suffer from the same gear-change problem?

thank you


 




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