ROTOR Q-rings change gear?

Discuss light weight issues concerning road bikes & parts.
vagbouk
Posts: 35
Joined: Fri Aug 20, 2010 8:10 am

by vagbouk

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.

by Weenie


audiojan
Posts: 756
Joined: Fri Jan 27, 2006 1:38 pm
Location: Greater Pittsburgh

by audiojan

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).
"Suddenly the thought struck me; my floor is someone elses ceiling" - Nils Ferlin

Geoff
Posts: 5015
Joined: Sat Dec 13, 2003 2:25 am
Location: Canada

by Geoff

Check the hanger, too.

vagbouk
Posts: 35
Joined: Fri Aug 20, 2010 8:10 am

by vagbouk

Anyone else??

Geoff
Posts: 5015
Joined: Sat Dec 13, 2003 2:25 am
Location: Canada

by Geoff

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...

trojancyclist
Posts: 7
Joined: Sat Jan 07, 2012 5:43 am

by trojancyclist

I've got the 50/34 Q rings and say that you should be looking at the rear der adjustment.

kevhogaz
Posts: 222
Joined: Fri Aug 05, 2011 5:18 am
Location: Arizona

by kevhogaz

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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trustbran
Posts: 129
Joined: Tue Apr 19, 2011 10:07 pm

by trustbran

Check the RD. period.

audiojan
Posts: 756
Joined: Fri Jan 27, 2006 1:38 pm
Location: Greater Pittsburgh

by audiojan

Like I said, it's the rear derailleur. Or the rider, but I kind of doubt that. :-)
"Suddenly the thought struck me; my floor is someone elses ceiling" - Nils Ferlin

Northoceanbeach
Posts: 137
Joined: Thu Jul 12, 2012 11:12 pm

by Northoceanbeach

Rear derailleur. It did affect my front shifting. And like above. Not enough to take them off.

vagbouk
Posts: 35
Joined: Fri Aug 20, 2010 8:10 am

by vagbouk

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?

Geoff
Posts: 5015
Joined: Sat Dec 13, 2003 2:25 am
Location: Canada

by Geoff

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.

vagbouk
Posts: 35
Joined: Fri Aug 20, 2010 8:10 am

by vagbouk

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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rmerka
Posts: 618
Joined: Wed Mar 06, 2013 4:23 pm
Location: Austin, TX

by rmerka

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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ave
Posts: 1660
Joined: Sun Dec 28, 2008 10:15 pm
Location: Hungary

by ave

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.

by Weenie


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