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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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Posts: n/a
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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  #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, 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"
  #7  
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"
  #8  
Old September 6th 04, 04:33 PM
Mike Jacoubowsky
external usenet poster
 
Posts: n/a
Default

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" wrote in message
...
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




  #9  
Old September 6th 04, 04:33 PM
Mike Jacoubowsky
external usenet poster
 
Posts: n/a
Default

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" wrote in message
...
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




  #10  
Old September 6th 04, 04:33 PM
Mike Jacoubowsky
external usenet poster
 
Posts: n/a
Default

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" wrote in message
...
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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