Campag Potenza chain noise problem.

[garyfarrar]

I have recently changed my groupset from Veloce to Potenza and am having a problem with chain noise when it is the small chainring and largest rear sprocket (34/32). Both mechs are shifting fine and there is no noise in any other chainring/sprocket combination. Also the chain doesn't look to be rubbing on the front mech cage anywhere. Any ideas welcome.

 

[Yellow Saddle]

Post a photo of the sprocket area in that combo.

 

[S-Express]

Probably limit screw related. .

 

[garyfarrar]

Post a photo of the sprocket area in that combo.

 

[Yellow Saddle]

View attachment 368826

Sorry, I should have said, side-on.

 

[garyfarrar]

Sorry, I should have said, side-on.

No problem.

 

[fossyant]

Your B screw needs tightening clockwise to shift the jockey away from the sprockets - its the one on the rear of the mech near the cable.

 

[Yellow Saddle]

As above. The jockey pulley teeth and sprocket teeth are connecting each other through the chain.

 

[Graeme_FK]

Don't try and adjust the screw in the "B" position as advised above - it's only very rarely necessary on this and related versions of the Campag rear derailleur - it's there in the case of the 2015 RDs as a way of correcting for rear hangers where the "hook" on the hanger has been placed further from the optimum position than used to be commonplace. The screw is alloy and easily damaged.

Instead, use the "H" screw on the lower pivot as recommended in the instruction book that came with the derailleur - or if no instructions came with the RD because it was OE supplied to the aftermarket (common occurrence) download it from www.campagnolo.com under "Support" and "Documentation".

 

[garyfarrar]

Thanks for all the advice. I've made some adjustments and now have the 5-7 mm gap between the sprocket and jockey wheel. The noise is still there though and seems to be from the chairing. The chain line looks like it's dropping into the inner ring at too great an angle.