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