Juddering Rear Mech

[Mista Preston]

Noted a new noise at the rear so I went through the process of re indexing my gears to make them smooth.

I have indexed my gears many times. When I am in the largest cog at the back and smallest at the front my rear mech judders up and down, not a lot but enough not to right. I have used the screws to change the reach of the mech with no joy, re indexed, checked cable tension.....


What else do I need to try to make it smooth again?



Cheers Mr P

 

[rusky]

Is the chain or cassette worn?

 

[Gerry Attrick]

Is the B tension correct? The top jockey wheel may be rubbing on the cassette sprocket.

 

[Tynan]

what rusky hints at?

something not running well in those gears is transmitting the tension to the spring in the rear mech, so maybe not the rear mech

 

[steve52]

why would u use the smallest chain ring and the smalest rear? the chain is at extreams then ?

 

[potsy]

Noted a new noise at the rear so I went through the process of re indexing my gears to make them smooth.

I have indexed my gears many times. When I am in the largest cog at the back and smallest at the front my rear mech judders up and down, not a lot but enough not to right. I have used the screws to change the reach of the mech with no joy, re indexed, checked cable tension.....


What else do I need to try to make it smooth again?



Cheers Mr P

why would u use the smallest chain ring and the smalest rear? the chain is at extreams then ?

Re-read required steve

 

[ianrauk]

I don't think the chain or cassette is worn. But do agree with GA, check the b tension screw to lower the derallieur a little.

 

[Mista Preston]

just spent the past hour trying the screws again. No joy. Is their anything else I can try?, could the mech have moved or something?, may need to go to the LBS

 

[Tollers]

Has The rear mech hanger taken a bash? How does the mech alignment look to the eye in lowest gear?

 

[steve52]

sounds like its not the indexing but the screw to adjust cage hight, (ie when its juddering the cage is making contact with the largest rear cog

 

[Tynan]

stiff link?

 

[2Loose]

B-Screw or stiff link. Low screw may be not far enough across, but apart from the stiff link, none of these become 'new' noises normally.

 

[betty swollocks]

Reality check:- is the chain threaded through the derailleur correctly?
You sure: check again?
Jockey wheels, clean? Worn?

 

[fossyant]

If the B screw wont pull mech from sprockets, then you may need to add a link to the chain (assuming you don't have stiff links etc)