Rear Drive System Help

adest

Hi, I am having some problems with setting my mtb rear drive system so that it works effectively.

My problem is that gear changes are often laboured or when the bike will change gear but then slip back to the previous gear.

I have been using the barrel adjuster on my rd (6 speed) to increase wire tension. When I do this, gear changes between the smallest sprockets become nice and instant, however, when in the largest sprockets i get the retelling noise that indicates that the chain is rubbing against the next largest sprocket.

Any ideas what I can do to make gear changes smoother across all sprockets.
Any help would be greatly appreciated.
Tim

nicklouse

I would start by changing the inner and outer cables. then have a good read of the infor on Parktools. check the stops are set correctly then adjust the tension.

delcol

how old is the drivetrain ? cables mech... new cables can work magic when the gear gremlins come out to play..

adest

Thanks for the help guys.
The bike has had light use since it was purchased brand new. Its been sat in the garage for a while since tho.
I think i will change the wires to the deraillier and see if that helps.
By 'stops' do you mean the H-L limit screws on the rd?

Thanks, Tim

The Rookie

Yes the H and L limit (or stop) screws need setting correctly otherwise they can stop the mech moving enough to engage all gears or allow it to move to far so the chain falls off the cassette!

nicklouse

adest wrote:

Thanks for the help guys.
The bike has had light use since it was purchased brand new. Its been sat in the garage for a while since tho.

Thanks, Tim

sorry that tells us nothing-
1 week 1year 10 years?

adest

Sorry... its been sat around for approx 2 years since i recently started using it again!

cooldad

Get new cables, inners and outers, follow the Parktools link in Nick's sig, loosen everything off and start from scratch.

YeehaaMcgee

could be that the mech pivots need some lubrication too.