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Sumo
Fox
Weird quite deep rumbling noise coming from my Ultegra rear mech, apparently from the jockey wheels. I've got a KMC X11 SL chain and as the chain goes over the jockey wheels it seems a bit lumpy, specifically as it passes round the upper jockey wheel.
If I turn the pedal with my hand as the bike's on the stand I can feel the rumbling through the pedal. This bike/groupset were new only about 1300 miles ago and it's just not smooth like it should be.
What's going on please?