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 Post subject: Chorus 2015+ users
PostPosted: Wed Dec 13, 2017 12:08 pm 
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Joined: Wed Jul 19, 2017 2:59 am
Posts: 152
Anyone using Campy Chorus rear derailleur?

I can't seem to get it to be quiet....or at least as quiet as when its on the small chainring.

Setup 50/34 front, 12-29 cassette.

Basically, its a grinding sound even when i'm on the big chainring and half way on the cassette which technically should be the most efficient combo.
The sound actually disappears/minimum when I'm on small chainring....

I've looked at the instructions and in most videos it seems to differ a little from the Record/SR which have a high limit and low limit screws.

I havent dropped the bike. The LBS did say my hanger is bent (no idea how) but he 'sort of' bent it back. Took the hanger off today, placed it on a flat surface with a light behind and i'm sure its flat.

recommendations? bit lost what to do

Wrong length chain?
Bent derailleur?
bent hanger that my eyes can't see?
bad chorus cassette?
frame problem?

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 Post subject: Re: Chorus 2015+ users
PostPosted: Wed Dec 13, 2017 6:11 pm 
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Joined: Fri Jan 29, 2016 12:54 pm
Posts: 70
Park tool make a tool for aligning a rear mech hanger. They're very commonly not aligned well from the factory.

Have you tried adjusting the cage tension? That might also be the problem. With a larger cassette you generally want to unscrew the screw a good few turns until the noise stops. This will make the upper pulley sit further from the sprockets.


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 Post subject: Re: Chorus 2015+ users
Posted: Wed Dec 13, 2017 6:11 pm 


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 Post subject: Re: Chorus 2015+ users
PostPosted: Wed Dec 13, 2017 6:26 pm 
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Joined: Thu Mar 03, 2016 8:37 pm
Posts: 95
jih wrote:
Park tool make a tool for aligning a rear mech hanger. They're very commonly not aligned well from the factory.

Have you tried adjusting the cage tension? That might also be the problem. With a larger cassette you generally want to unscrew the screw a good few turns until the noise stops. This will make the upper pulley sit further from the sprockets.
Correct.
2015+ Campy derailleurs are very sensitive to drop-out alignment. Now that you've taken it off, you need a shop to align it again.


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 Post subject: Re: Chorus 2015+ users
PostPosted: Wed Dec 13, 2017 7:36 pm 
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Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1901
Location: Welland, Ontario
Sounds like bad alignment.

Many OE hangers don't like being realigned, and may fail catastrophically. I'd strongly suggest a new Wheels Man. hanger first, then alignment check.

I'd also suggest looking up the Campy instruction sheet and following it in terms of height, stops and indexing.

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 Post subject: Re: Chorus 2015+ users
PostPosted: Fri Dec 15, 2017 5:30 am 
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Joined: Wed Jul 19, 2017 2:59 am
Posts: 152
Thanks, I'll try it again.

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 Post subject: Re: Chorus 2015+ users
PostPosted: Fri Dec 15, 2017 7:34 am 
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Joined: Sat Jan 26, 2008 10:25 am
Posts: 497
Location: Cantabria
But check alignment of the hanger ON the bike. The mech has to be aligned with the cogs it has to serve, it doesn’t really matter if your hanger is perfectly flat as the misalignment could be due to a flared dropout or anything else.


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 Post subject: Re: Chorus 2015+ users
Posted: Fri Dec 15, 2017 7:34 am 


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 Post subject: Re: Chorus 2015+ users
PostPosted: Fri Dec 15, 2017 11:31 am 
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Joined: Sun Jun 21, 2015 9:34 pm
Posts: 50
Although Campag say that their short cage derailleurs work with up to 29 teeth cassettes, I could never get my Record or Chorus derailleurs to work without being noisy. Mechanically they shifted fine, but were noisy.

On my winter bike I use a longer caged Xenon rear derailleur with 29 tooth cassette and its absolutely perfect... no noise at all and shifts just fine.


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