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Jumping chain.



 
 
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  #1  
Old December 31st 04, 05:39 PM
Tazlvr
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Default Jumping chain.

I have a new bike. It has ShimanoDeore gears.When I'm on smaller sprockets
the chain seems to slip a tooth. It does it randomly, not just when i'm
putting a lot of pressure on it. I can't get to the bikeshop now until after
new year. I went on to Sheldon Brown which said it's either a worn chain,
which it obviously isn't or bent deurailler, which it isn't. Any ideas as to
what it could be.
TIA
Gaz


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  #2  
Old December 31st 04, 05:52 PM
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See: http://sheldonbrown.com/derailer-adj...html#stifflink

Sheldon "Very Large Website" Brown
Newtonville, Masssachusetts
+---------------------------------------------------+
| The important thing is not to stop questioning. |
| Curiosity has its own reason for existing. |
| --Albert Einstein |
+---------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

  #3  
Old December 31st 04, 06:56 PM
elyob
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wrote in message
oups.com...
See: http://sheldonbrown.com/derailer-adj...html#stifflink

Sheldon "Very Large Website" Brown
Newtonville, Masssachusetts


Happy New Year Sheldon from all of us in the UK who use your "Very Large
Website" regularly!!

Glad to see you dropping by as well!

Nick "chain slipping problem at the moment too, must clean my chain" Boyle


  #4  
Old December 31st 04, 08:27 PM
bob watkinson
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"Tazlvr" wrote in message
...
I have a new bike. It has ShimanoDeore gears.When I'm on smaller sprockets
the chain seems to slip a tooth. It does it randomly, not just when i'm
putting a lot of pressure on it. I can't get to the bikeshop now until
after new year. I went on to Sheldon Brown which said it's either a worn
chain, which it obviously isn't or bent deurailler, which it isn't. Any
ideas as to what it could be.
TIA
Gaz

Check each link Gaz. Make sure they all pivot freely. If you find a stiff
link use sideways pressure to ease it off.


  #5  
Old December 31st 04, 08:45 PM
Simon D
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Default

"Tazlvr" wrote in message
...
I have a new bike. It has ShimanoDeore gears.When I'm on smaller sprockets
the chain seems to slip a tooth. It does it randomly, not just when i'm
putting a lot of pressure on it. I can't get to the bikeshop now until
after new year. I went on to Sheldon Brown which said it's either a worn
chain, which it obviously isn't or bent deurailler, which it isn't. Any
ideas as to what it could be.

Other respondents' suggestions about stiff links are reasonable, especially
if it's a new bike. However, also make sure that any spacers are correctly
positioned in the cassette (you should be able to see if some sprockets are
much closer together than the others), that the teeth of the sprockets
concerned are not damaged (be careful, because Shimano HG sprockets are
oddly and irregularly shaped anyway), and even that there are no bolts
(mudguard fixing, e.g.) fouling the chain.


  #6  
Old December 31st 04, 09:56 PM
Simon Brooke
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in message .com,
') wrote:

See:
http://sheldonbrown.com/derailer-adj...html#stifflink


Coo!

Now that's an honour, lad, that most folk don't get.

The great Sheldon answering your question himself.

--
(Simon Brooke) http://www.jasmine.org.uk/~simon/
Windows 95:
You, you, you! You make a grown man cry...
M. Jagger/K. Richards
  #7  
Old December 31st 04, 10:17 PM
Eatmorepies
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"Tazlvr" wrote in message
...
I have a new bike. It has ShimanoDeore gears.When I'm on smaller sprockets
the chain seems to slip a tooth. It does it randomly, not just when i'm
putting a lot of pressure on it. I can't get to the bikeshop now until

after
new year. I went on to Sheldon Brown which said it's either a worn chain,
which it obviously isn't or bent deurailler, which it isn't. Any ideas as

to
what it could be.


New bike = cables settling in (possibly). Tighten the cable a quarter turn
at a time at the rear mech adjusment screw. Test to see if the bike shifts
smoothly.

Else go to the basic method. Stick the bike in the second smallest rear cog
and turn the barrel adjuster until the chain just just just wants to skip up
to the next cog, then turn the barrel back one (or two) quarter turns (the
bike does need to be off the ground for this method).

John


  #8  
Old December 31st 04, 11:46 PM
Adrian Boliston
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"Eatmorepies" wrote:

"Tazlvr" wrote in message
...
I have a new bike. It has ShimanoDeore gears.When I'm on smaller
sprockets the chain seems to slip a tooth. It does it randomly, not
just when i'm putting a lot of pressure on it. I can't get to the
bikeshop now until after new year. I went on to Sheldon Brown which
said it's either a worn chain, which it obviously isn't or bent
deurailler, which it isn't. Any ideas as to what it could be.


New bike = cables settling in (possibly). Tighten the cable a quarter
turn at a time at the rear mech adjusment screw. Test to see if the
bike shifts smoothly.


My new bike used to skip, mainly on the smallest 2 rear cogs, and I thought
I had a dodgy rear casette, but I finally adjusted the cable tension and
that fixed it.


  #9  
Old January 1st 05, 12:02 AM
Sniper8052(L96A1)
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Posts: n/a
Default

Adrian Boliston wrote:
"Eatmorepies" wrote:


"Tazlvr" wrote in message
...

I have a new bike. It has ShimanoDeore gears.When I'm on smaller
sprockets the chain seems to slip a tooth. It does it randomly, not
just when i'm putting a lot of pressure on it. I can't get to the
bikeshop now until after new year. I went on to Sheldon Brown which
said it's either a worn chain, which it obviously isn't or bent
deurailler, which it isn't. Any ideas as to what it could be.


New bike = cables settling in (possibly). Tighten the cable a quarter
turn at a time at the rear mech adjusment screw. Test to see if the
bike shifts smoothly.



My new bike used to skip, mainly on the smallest 2 rear cogs, and I thought
I had a dodgy rear casette, but I finally adjusted the cable tension and
that fixed it.


If it's new wait until after new year and go back to the shop. Don't
mess with stuff if it's their responsibility to fix it.
Hell it's only a day or two, can't you use an old bike or just make do?
Sniper8052
 




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