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MTB shifting problems



 
 
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  #1  
Old March 17th 04, 04:05 AM
hippy
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Posts: n/a
Default MTB shifting problems

"Marky" wrote in message
...
Hi everyone, I need some help with my 2003 Giant Yukon MTB. A couple

of
gears make noise while riding and this is after the second time I have
brought the bike back to get them correctly adjusted.

The problem occurs in the following situations:
Largest chainwheel on front, smallest cog on rear (top gear)
Largest chainwheel on front, largest cog on rear
Largest chainwheel on front, second largest cog on rear

Can anybody here post a clear guide to fixing my problem, I don't want

to go
to the dealer again for this.
I do have the owners manual but am still unsure of exactly what I
should/shouldn't touch with regards to the specific problems I have.

All
gears shift fine (ie they do go into gear) its just the noise factor

that's
very annoying.


It's probably the chain rubbing the front derr. cage.
Be careful adjusting this - you can throw the chain
off by overshifting. I think it's caused by poorly adjusted
deraileurs and flexing of the bike's frame when pushing
hard.. See he
http://www.sheldonbrown.com/derailer-adjustment.html

Oh, you probably should try and avoid the extreme
chain angles caused when you are in "big" - "big"
or "small" - "small"...

hth
hippy


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  #2  
Old March 17th 04, 04:57 AM
Marky
external usenet poster
 
Posts: n/a
Default MTB shifting problems

Hi everyone, I need some help with my 2003 Giant Yukon MTB. A couple of
gears make noise while riding and this is after the second time I have
brought the bike back to get them correctly adjusted.

The problem occurs in the following situations:
Largest chainwheel on front, smallest cog on rear (top gear)
Largest chainwheel on front, largest cog on rear
Largest chainwheel on front, second largest cog on rear

Can anybody here post a clear guide to fixing my problem, I don't want to go
to the dealer again for this.
I do have the owners manual but am still unsure of exactly what I
should/shouldn't touch with regards to the specific problems I have. All
gears shift fine (ie they do go into gear) its just the noise factor that's
very annoying.

Thank You.


  #3  
Old March 17th 04, 06:15 AM
amirm
external usenet poster
 
Posts: n/a
Default MTB shifting problems

Marky wrote:
Hi everyone, I need some help with my 2003 Giant Yukon MTB. A couple of
gears make noise while riding and this is after the second time I have
brought the bike back to get them correctly adjusted.
The problem occurs in the following situations: Largest chainwheel
on front, smallest cog on rear (top gear) Largest chainwheel on
front, largest cog on rear Largest chainwheel on front, second
largest cog on rear
Can anybody here post a clear guide to fixing my problem, I don't want
to go to the dealer again for this. I do have the owners manual but am
still unsure of exactly what I should/shouldn't touch with regards to
the specific problems I have. All gears shift fine (ie they do go into
gear) its just the noise factor that's very annoying.
Thank You.


Hi Marky:

Have a read, just for your reference. This is from Deore, but th
method is more or less the same among all models. Be aware that bot
are .pdf manuals

It's better to check the angle of front derailleur, its upper an
lower limit settings as well as making sure that the cage is in th
perfect shape

The front derail. on my brand new MTB had a rubbing problem that coul
not be fixed through all adjustment tricks. It turned out that the fron
bit of the cage's outer edge was slightly bent inside. A grip and
little muscle work made it perfect. :

Cheers, Amir

http://www.shimano.com.au/publish/co...cling/customer
_support/service_diagrams/2004_mountain_sd.MainContentPar.0024.Schemati
c.0001.File.tmp/fc_m510_si.pd

http://www.shimano.com.au/publish/co...cling/customer
_support/service_diagrams/2004_mountain_sd.MainContentPar.0024.Schemati
c.0002.File.tmp/rd_m510_si.pd



-


  #4  
Old March 18th 04, 07:30 PM
kingsley
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Posts: n/a
Default MTB shifting problems

On Wed, 17 Mar 2004 14:57:33 +1000, Marky wrote:

... A couple of
gears make noise while riding and this is after the second time I have
brought the bike back to get them correctly adjusted.
...
Largest chainwheel on front, largest cog on rear


You shouldn't really use this combination if you can help it,
In big-big the chain is at it's most 'diagonal'. Knock it
down to the middle ring first.

There's probably a barrel adjuster up where the cable housing enters
the shifter pod. While riding along, you can give this a _slight_
turn and trim the derailleur position. Start off with a quarter
turn or suchlike. If you wind it too far, you might find you have
trouble changing back into the small ring. (in which case just trim
it back the other way).

You haven't given the front derailleur a knock or something ?

-kt





  #5  
Old March 18th 04, 11:01 PM
Marky
external usenet poster
 
Posts: n/a
Default MTB shifting problems


"kingsley" wrote in message
newsan.2004.03.17.20.39.46.748239@maddogsbreakfa st.com.au...
On Wed, 17 Mar 2004 14:57:33 +1000, Marky wrote:

... A couple of
gears make noise while riding and this is after the second time I have
brought the bike back to get them correctly adjusted.
...
Largest chainwheel on front, largest cog on rear


You shouldn't really use this combination if you can help it,
In big-big the chain is at it's most 'diagonal'. Knock it
down to the middle ring first.


Yep, I'll refrain from using the extreme combinations


There's probably a barrel adjuster up where the cable housing enters
the shifter pod. While riding along, you can give this a _slight_
turn and trim the derailleur position. Start off with a quarter
turn or suchlike. If you wind it too far, you might find you have
trouble changing back into the small ring. (in which case just trim
it back the other way).

You haven't given the front derailleur a knock or something ?


No knocks at all, anyway I'm taking it to my dealer tonight, annoying sound
in top gear needs to be fixed before Sundays bike ride.

Thanks everyone
-kt







 




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