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



 
 
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  #1  
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


  #2  
Old September 6th 04, 01:44 PM
Arthur Harris
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Posts: n/a
Default

"Yuri Budilov" wrote:

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).

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...ent.html#front

and

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

Art Harris



  #3  
Old September 6th 04, 01:44 PM
Arthur Harris
external usenet poster
 
Posts: n/a
Default

"Yuri Budilov" wrote:

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).

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...ent.html#front

and

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

Art Harris



  #4  
Old September 6th 04, 01:44 PM
Arthur Harris
external usenet poster
 
Posts: n/a
Default

"Yuri Budilov" wrote:

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).

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...ent.html#front

and

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

Art Harris



  #5  
Old September 6th 04, 02:10 PM
Qui si parla Campagnolo
external usenet poster
 
Posts: n/a
Default

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. BRBR
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 BRBR


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"
  #6  
Old September 6th 04, 11:28 PM
JayofMontreal
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Posts: n/a
Default

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 " wrote in message
...
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. BRBR
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 BRBR


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


  #7  
Old September 6th 04, 11:28 PM
JayofMontreal
external usenet poster
 
Posts: n/a
Default

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 " wrote in message
...
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. BRBR
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 BRBR


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


  #8  
Old September 6th 04, 11:28 PM
JayofMontreal
external usenet poster
 
Posts: n/a
Default

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 " wrote in message
...
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. BRBR
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 BRBR


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


  #9  
Old September 6th 04, 02:10 PM
Qui si parla Campagnolo
external usenet poster
 
Posts: n/a
Default

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. BRBR
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 BRBR


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"
  #10  
Old September 6th 04, 02:10 PM
Qui si parla Campagnolo
external usenet poster
 
Posts: n/a
Default

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. BRBR
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 BRBR


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"
 




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