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PostPosted: Sat Mar 09, 2013 2:15 pm 
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Joined: Fri Aug 20, 2010 8:10 am
Posts: 35
I use Q-rings with Dura Ace 7900 the last 2 months and I noticed that when I have the last gear, for example 23 in 11-23 cassette or 25 in 11-25 with big(53) and small(39) crankset and I push(pedal hard) it tends to change gear from 23 to 21 or 25 to 23.
It doesn't change but I can hear that the chain tries to go down.
I have searched everything and the only expanation that I have took it's because of the oval shape of the Q-rings.
I just want to know if it's actually from the Q-rings and if I can do anything to stop it.


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Posted: Sat Mar 09, 2013 2:15 pm 


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PostPosted: Sat Mar 09, 2013 2:22 pm 
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Location: Greater Pittsburgh
That sounds like you have an issue with the rear derailleur. The shape of the Q-rings has very little effect on the shifting of the rear derailleur, but does have a little more lag when shifting the front derailleur compared to a round ring (for me, it's worth the trade of).

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PostPosted: Sat Mar 09, 2013 7:27 pm 
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Joined: Sat Dec 13, 2003 2:25 am
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Location: Canada
Check the hanger, too.


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PostPosted: Sun Mar 10, 2013 8:15 pm 
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Joined: Fri Aug 20, 2010 8:10 am
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Anyone else??


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PostPosted: Mon Mar 11, 2013 12:20 am 
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Location: Canada
Nope. No one else. It just ain't the rings. If you are waiting for someone to corroborate your hypothesis that it is, you might be waiting a long time...


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PostPosted: Mon Mar 11, 2013 1:12 am 
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Joined: Sat Jan 07, 2012 5:43 am
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I've got the 50/34 Q rings and say that you should be looking at the rear der adjustment.


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PostPosted: Mon Mar 11, 2013 4:41 am 
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Joined: Fri Aug 05, 2011 5:18 am
Posts: 112
I used mine for a while, and never had trouble with rear shifting. Like everybody else said, check and adjust your derailleur, and make sure your hanger is straight. Maybe the screw that limits the travel, has been affected?


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PostPosted: Mon Mar 11, 2013 7:25 pm 
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Check the RD. period.

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PostPosted: Tue Mar 12, 2013 1:25 am 
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Location: Greater Pittsburgh
Like I said, it's the rear derailleur. Or the rider, but I kind of doubt that. :-)

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PostPosted: Tue Mar 12, 2013 3:52 am 
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Joined: Thu Jul 12, 2012 11:12 pm
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Rear derailleur. It did affect my front shifting. And like above. Not enough to take them off.


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PostPosted: Tue Mar 12, 2013 12:14 pm 
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Firstly, thank you all :)

When you say derailleur issue you mean that I must adjust it or I must start looking for a new one?


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PostPosted: Tue Mar 12, 2013 1:49 pm 
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Location: Canada
Assuming that the cassette is correctly assembled, the chain is correctly installed and both are in decent condition, the symptoms you are describing appear to be a rear derailleur/hanger problem, not a chainring problem.

Most derailleurs have more than enough capacity to deal with the minor changes in chain tension created by 'Q'-rings in normal operation. I do not think you need a new derailleur, it could just need to be adjusted better, though it sounds more like a hanger issue to me.


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PostPosted: Tue Mar 12, 2013 2:40 pm 
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The cassette is correctly assembled.
Cassette and chain are new.

The chain length must be like with standard rings or different?

With "hanger" which exactly component do you mean?


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PostPosted: Tue Mar 12, 2013 3:57 pm 
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Location: Austin, TX
Chain length is adujusted the same as round rings. The hanger is the little piece of metal that attaches to the frame so you can attach the derailleur. Sits in between the RD and the frame.

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PostPosted: Tue Mar 12, 2013 4:44 pm 
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Location: Hungary
small ring x 25 is the problem, or the big ring x 25? Or both?

If shifting is otherwise perfect then it's just the limiter screw.


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Posted: Tue Mar 12, 2013 4:44 pm 


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