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

Yuri Budilov said:

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

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.

It's generally a good idea to shift to the small front ring before you get
to the largest rear cogs (and vice versa).

Quoted message said:

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?

I don't think there's any inherent difference betweeen Sora, 105, and
Ultegra in this regard.

I think you should be able to eliminate the drop offs by:

1) Adjusting the limit screws on the front derailleur.

2) Having some slack in the cable tension when on the small ring.

3) Getting the derailleur cage as close as possible to the teeth on the big
ring (~1mm).

4) Adjusting the angle of the derailleur cage slightly (as viewed from
above).

See:
http://www.sheldonbrown.com/derailer-adjustment.html#front

and

http://www.parktool.com/repair_help/howfix_frontderailleur.shtml

Art Harris

yuri-<< 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. >><BR><BR>
<< 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 >><BR><BR>

Third Eye or Jumpstop chain watcher. A plastic doo-dad that will prevent your
chain from falling off the small ring. Not uncommon with any lever mounted
shifting systems.

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

Quoted message said:

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.

As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher will
eliminate the possibility of the chain coming off. Another option is that
it's possible your chain is worn out. You don't have enough mileage per se
for that to be an issue, unless your chain is worn due to being dirty &
neglected; that can wear out a chain faster than the miles would indicate.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Yuri Budilov" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

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

I think your statement about chain drop is inaccurate. I've only had the
chain drop once, and that was with an Ultegra front derailleur which was a
braze on (can you say flexy as hell!!).

I have a 105 bike, and this has NEVER happened, on my two Dura Ace bikes its
NEVER happened.

I suggest that the LBS is either a) too lazy to properly set up the bike or
b) the chain is worn or dirty and that is a maintenace issue.

"Qui si parla Campagnolo " <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

yuri-<< 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. >><BR><BR>
<< 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 >><BR><BR>

Third Eye or Jumpstop chain watcher. A plastic doo-dad that will prevent
your
chain from falling off the small ring. Not uncommon with any lever mounted
shifting systems.

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

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.745 / Virus Database: 497 - Release Date: 8/30/2004

Mike-<< As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher will
eliminate the possibility of the chain coming off. >><BR><BR>

Would love to see framesets with a bracket to attach these things as standard.
Particularly for framesets with BB lugsets that prevent it, like some Calfees
and Trek...

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

Mike-<< As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher will
eliminate the possibility of the chain coming off. >><BR><BR>

Would love to see framesets with a bracket to attach these things as standard.
Particularly for framesets with BB lugsets that prevent it, like some Calfees
and Trek...

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

Quoted message said:

Mike-<< As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher
will
eliminate the possibility of the chain coming off. >><BR><BR>

Would love to see framesets with a bracket to attach these things as
standard.
Particularly for framesets with BB lugsets that prevent it, like some
Calfees
and Trek...

You got that right! Would be wonderful if they'd think about this sort of
thing ahead of time, but sometimes the engineers just don't get it...
they're thinking that no racer would ever want that sort of thing on their
bike, nor would they. We almost got it when the E-type derailleurs came
out.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Qui si parla Campagnolo " <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Mike-<< As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher
will
eliminate the possibility of the chain coming off. >><BR><BR>

Would love to see framesets with a bracket to attach these things as
standard.
Particularly for framesets with BB lugsets that prevent it, like some
Calfees
and Trek...

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

Quoted message said:

I think your statement about chain drop is inaccurate. I've only had the
chain drop once, and that was with an Ultegra front derailleur which was a
braze on (can you say flexy as hell!!).

I have a 105 bike, and this has NEVER happened, on my two Dura Ace bikes
its NEVER happened.

Life is treating you well!

Quoted message said:

I suggest that the LBS is either a) too lazy to properly set up the bike

Not too likely in Peter's case, nor mine. We go to great trouble making
bikes work as well as possible, since happier bike riders ride more, infect
friends with the bike bug, and are very good for business.

Quoted message said:

or b) the chain is worn or dirty and that is a maintenace issue.

Worn & dirty chains definitely make things worse; my chain is far more
likely to shift off the inside when it's got over 1500 miles on it (before
that it's rare); I generally replace it at about 1800 miles. Still within
the established limits of wear, but shifting is definitely better with a new
chain.

Cleanliness helps as well; a clean & lubed chain is definitely a happier
chain. However, if you've got a bike with very short chainstays, a
wide-range rear cassette and a front chainring combo that's at the limits of
the derailleur's capacity, and/or tend to shift from the large to small
front when you're already on one of the two largest rear cogs, you're far
more likely to have issues with the chain coming off the inside.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"JayofMontreal" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I think your statement about chain drop is inaccurate. I've only had the
chain drop once, and that was with an Ultegra front derailleur which was a
braze on (can you say flexy as hell!!).

I have a 105 bike, and this has NEVER happened, on my two Dura Ace bikes
its NEVER happened.

I suggest that the LBS is either a) too lazy to properly set up the bike
or b) the chain is worn or dirty and that is a maintenace issue.

"Qui si parla Campagnolo " <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

yuri-<< 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. >><BR><BR>
<< 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 >><BR><BR>

Third Eye or Jumpstop chain watcher. A plastic doo-dad that will prevent
your
chain from falling off the small ring. Not uncommon with any lever
mounted
shifting systems.

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

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.745 / Virus Database: 497 - Release Date: 8/30/2004

thanks all

More info: my chain/bike/groupset has done ~1700 km (1100 miles) since early
Jan 2004. It gets a lube from LBS every 800 km or so. I am not sure how long
Sora chain should last. Any guesses? I ride on dry road 90% of the time and
never ride when raining. It also started skipping on small ring/small rear
cog, sometimes, I know I should stay away from those gear combinations but
sometimes it is hard for a novice rider like me....

Should I buy a 105 or Ultegra chain to replace the Sora chain - will this
help shifting and chain dropping problems on Trek 1000?

I will hunt for Chain Watcher/ThirdEye/Jumpstop in the meantime, sounds like
what the doctor ordered. Thanks!

"Mike Jacoubowsky" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

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.

As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher will
eliminate the possibility of the chain coming off. Another option is that
it's possible your chain is worn out. You don't have enough mileage per
se for that to be an issue, unless your chain is worn due to being dirty &
neglected; that can wear out a chain faster than the miles would indicate.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Yuri Budilov" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

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

Quoted message said:

More info: my chain/bike/groupset has done ~1700 km (1100 miles) since
early Jan 2004. It gets a lube from LBS every 800 km or so. I am not sure
how long Sora chain should last. Any guesses? I ride on dry road 90% of
the time and never ride when raining. It also started skipping on small
ring/small rear cog, sometimes, I know I should stay away from those gear
combinations but sometimes it is hard for a novice rider like me....

Not sure what it means when you say you never ride in the rain, but ride on
"dry" roads 90% of the time. What's going on the other 10%? If you're
riding on wet roads, you might as well be riding in the rain, and it's
possible that rain might even be preferable (in terms of washing grit off
your drivetrain in a heavy downpour... been there, seen that).

Lubing every 800km may not be adequate, particularly if you're seeing wet
roads.

Quoted message said:

Should I buy a 105 or Ultegra chain to replace the Sora chain - will this
help shifting and chain dropping problems on Trek 1000?

The '105 & Ultegra chains aren't compatible with your 8-speed system. The
best chain I've found is the HG91, but they're rather expensive and mainly
have benefits in ways that are relevant to mountain bikes (stronger side
link connections). An appropriate KMC chain won't cost too much and should
work very nicely.

Quoted message said:

I will hunt for Chain Watcher/ThirdEye/Jumpstop in the meantime, sounds
like what the doctor ordered. Thanks!

Yep, the darned things do exactly what they're supposed to.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Yuri Budilov" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

thanks all

More info: my chain/bike/groupset has done ~1700 km (1100 miles) since
early Jan 2004. It gets a lube from LBS every 800 km or so. I am not sure
how long Sora chain should last. Any guesses? I ride on dry road 90% of
the time and never ride when raining. It also started skipping on small
ring/small rear cog, sometimes, I know I should stay away from those gear
combinations but sometimes it is hard for a novice rider like me....

Should I buy a 105 or Ultegra chain to replace the Sora chain - will this
help shifting and chain dropping problems on Trek 1000?

I will hunt for Chain Watcher/ThirdEye/Jumpstop in the meantime, sounds
like what the doctor ordered. Thanks!

"Mike Jacoubowsky" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

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.

As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher will
eliminate the possibility of the chain coming off. Another option is
that it's possible your chain is worn out. You don't have enough mileage
per se for that to be an issue, unless your chain is worn due to being
dirty & neglected; that can wear out a chain faster than the miles would
indicate.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Yuri Budilov" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

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

thanks Mike!

yes, I ride ~90% on dry roads and ~10% of the distance on damp/wet road i.e.
after rain stopped and road is still damp/wet. How often (distance?) should
I lubricate the chain in this case?

My LBS thought that 105 chain or even Ultegra chain will work on Sora
rings/cogs/gears..... Strange. Anyhow, I will keep an eye on the KMC chain.

thanks again

"Mike Jacoubowsky" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

More info: my chain/bike/groupset has done ~1700 km (1100 miles) since
early Jan 2004. It gets a lube from LBS every 800 km or so. I am not sure
how long Sora chain should last. Any guesses? I ride on dry road 90% of
the time and never ride when raining. It also started skipping on small
ring/small rear cog, sometimes, I know I should stay away from those gear
combinations but sometimes it is hard for a novice rider like me....

Not sure what it means when you say you never ride in the rain, but ride
on "dry" roads 90% of the time. What's going on the other 10%? If you're
riding on wet roads, you might as well be riding in the rain, and it's
possible that rain might even be preferable (in terms of washing grit off
your drivetrain in a heavy downpour... been there, seen that).

Lubing every 800km may not be adequate, particularly if you're seeing wet
roads.

Quoted message said:

Should I buy a 105 or Ultegra chain to replace the Sora chain - will this
help shifting and chain dropping problems on Trek 1000?

The '105 & Ultegra chains aren't compatible with your 8-speed system. The
best chain I've found is the HG91, but they're rather expensive and mainly
have benefits in ways that are relevant to mountain bikes (stronger side
link connections). An appropriate KMC chain won't cost too much and
should work very nicely.

Quoted message said:

I will hunt for Chain Watcher/ThirdEye/Jumpstop in the meantime, sounds
like what the doctor ordered. Thanks!

Yep, the darned things do exactly what they're supposed to.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Yuri Budilov" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

thanks all

More info: my chain/bike/groupset has done ~1700 km (1100 miles) since
early Jan 2004. It gets a lube from LBS every 800 km or so. I am not sure
how long Sora chain should last. Any guesses? I ride on dry road 90% of
the time and never ride when raining. It also started skipping on small
ring/small rear cog, sometimes, I know I should stay away from those gear
combinations but sometimes it is hard for a novice rider like me....

Should I buy a 105 or Ultegra chain to replace the Sora chain - will this
help shifting and chain dropping problems on Trek 1000?

I will hunt for Chain Watcher/ThirdEye/Jumpstop in the meantime, sounds
like what the doctor ordered. Thanks!

"Mike Jacoubowsky" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

> 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.

As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher will
eliminate the possibility of the chain coming off. Another option is
that it's possible your chain is worn out. You don't have enough
mileage per se for that to be an issue, unless your chain is worn due to
being dirty & neglected; that can wear out a chain faster than the miles
would indicate.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Yuri Budilov" <[email hidden]> wrote in message
news:[email hidden]...
> 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
>
>

Quoted message said:

yes, I ride ~90% on dry roads and ~10% of the distance on damp/wet road
i.e. after rain stopped and road is still damp/wet. How often (distance?)
should I lubricate the chain in this case?

It's as important that the chain is kept clean as it is lubricated, and that
10% of riding on wet roads is definitely going to cause your chain to
collect a lot of grit. I've read that it's almost bad to lubricate a dirty
chain, and, in fact, I can see the point that it might move more grit into
the chain (instead of flushing it out). However, to me it's preferable to a
squeaky chain, and I've often seen squeaky chains become sticking chains
(but I've rarely seen well-lubed but dirty chains have stiff link problems).
So if you can't clean the chain, and it appears dry (no obvious lubrication)
after it's had a chance to dry out, I'd relube it.

Quoted message said:

My LBS thought that 105 chain or even Ultegra chain will work on Sora
rings/cogs/gears..... Strange. Anyhow, I will keep an eye on the KMC
chain.

The 9-speed chain may work, just not as well as one made for the
slightly-different spacing of the 8-speed components.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Yuri Budilov" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

thanks Mike!

yes, I ride ~90% on dry roads and ~10% of the distance on damp/wet road
i.e. after rain stopped and road is still damp/wet. How often (distance?)
should I lubricate the chain in this case?

My LBS thought that 105 chain or even Ultegra chain will work on Sora
rings/cogs/gears..... Strange. Anyhow, I will keep an eye on the KMC
chain.

thanks again

"Mike Jacoubowsky" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

More info: my chain/bike/groupset has done ~1700 km (1100 miles) since
early Jan 2004. It gets a lube from LBS every 800 km or so. I am not
sure how long Sora chain should last. Any guesses? I ride on dry road
90% of the time and never ride when raining. It also started skipping on
small ring/small rear cog, sometimes, I know I should stay away from
those gear combinations but sometimes it is hard for a novice rider like
me....

Not sure what it means when you say you never ride in the rain, but ride
on "dry" roads 90% of the time. What's going on the other 10%? If
you're riding on wet roads, you might as well be riding in the rain, and
it's possible that rain might even be preferable (in terms of washing
grit off your drivetrain in a heavy downpour... been there, seen that).

Lubing every 800km may not be adequate, particularly if you're seeing wet
roads.

Quoted message said:

Should I buy a 105 or Ultegra chain to replace the Sora chain - will
this help shifting and chain dropping problems on Trek 1000?

The '105 & Ultegra chains aren't compatible with your 8-speed system.
The best chain I've found is the HG91, but they're rather expensive and
mainly have benefits in ways that are relevant to mountain bikes
(stronger side link connections). An appropriate KMC chain won't cost
too much and should work very nicely.

Quoted message said:

I will hunt for Chain Watcher/ThirdEye/Jumpstop in the meantime, sounds
like what the doctor ordered. Thanks!

Yep, the darned things do exactly what they're supposed to.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

"Yuri Budilov" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

thanks all

More info: my chain/bike/groupset has done ~1700 km (1100 miles) since
early Jan 2004. It gets a lube from LBS every 800 km or so. I am not
sure how long Sora chain should last. Any guesses? I ride on dry road
90% of the time and never ride when raining. It also started skipping on
small ring/small rear cog, sometimes, I know I should stay away from
those gear combinations but sometimes it is hard for a novice rider like
me....

Should I buy a 105 or Ultegra chain to replace the Sora chain - will
this help shifting and chain dropping problems on Trek 1000?

I will hunt for Chain Watcher/ThirdEye/Jumpstop in the meantime, sounds
like what the doctor ordered. Thanks!

"Mike Jacoubowsky" <[email hidden]> wrote in message
news:[email hidden]...
>> 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.
>
> As Peter (Qui si parla Campagnolo) mentioned, the Chain Watcher will
> eliminate the possibility of the chain coming off. Another option is
> that it's possible your chain is worn out. You don't have enough
> mileage per se for that to be an issue, unless your chain is worn due
> to being dirty & neglected; that can wear out a chain faster than the
> miles would indicate.
>
> --Mike-- Chain Reaction Bicycles
> www.ChainReactionBicycles.com
>
>
> "Yuri Budilov" <[email hidden]> wrote in message
> news:[email hidden]...
>> 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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>