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Noisy while in 52-12 combo

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Noisy while in 52-12 combo

Old 03-15-15, 09:28 AM
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Noisy while in 52-12 combo

Hi guys. For the last few days I've been trying to get rid of some noise coming from the rear derailleur in the 52-12 gear combo on my wife's bike. The bike is 2009 Cervelo R3 and the groupset is a brand new Ultegra 6800 52-36, 11-28. I can't figure out what's making the rubbing noise. The top jockey wheel looks lined up with the 12 sprocket. The noise is only coming from this gear combo. I can get rid of this noise by tightening the derailleur cable a couple turns. The rattling noise goes away when I do this but upshifting and downshifting is obviously affected.

I took the bike to my LBS and the owner/mechanic looked at the hanger and immediately said the hanger was crooked/bent. I didn't think it was bent. The bike previously had Ultegra 6600 on it and there were no issues with the shifting whatsoever. The bike has never been crashed or dropped so I didn't think the hanger was the issue. I went ahead and bought a new Wheels Manufacturing rear hanger and replaced the old one. I still get the rattling noise from the same gear combo. BTW how much flexing should there be from the hanger when the skewer is closed? Thanks for any help you can give me.
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Old 03-15-15, 10:06 AM
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Try tightening the rear derailleur's high limit screw a fraction of a turn.
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Old 03-15-15, 10:14 AM
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things might be worn or dirty..

Stand behind.. & Look .. pulley on H side should stop dead on under the last cog.

I set the H screw before installing cable or chain .
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Old 03-15-15, 10:24 AM
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when did the problem start or has it been a problem all along?

regardless, if i had a similar cassette i would swap it in and see it if makes a difference. it's easy enough, if you have one.
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Old 03-15-15, 10:26 AM
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I ride a 52/12 everyday... never a problem.
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Old 03-15-15, 10:30 AM
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Unlike the low gear, where alignment is centered on the sprocket, the top jockey wheel should align to the right edge (when viewed from behind) of the smallest sprocket. You probably did this but it might be worth checking.
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