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PostPosted: Fri Dec 14, 2012 7:22 am 
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Joined: Sat Nov 14, 2009 6:30 am
Posts: 858
Location: So Cal
I recently installed a set of 52/36 Q-Rings onto my Cervelo S2. For the life of me...I can't get a good shift onto the big ring. This setup was on a different bike using a clamp adapter...and the shifting was great. Now that I moved it onto my Cervelo...it will not shift properly onto the big ring. It shifts fine on the stand...soon as I get on the bike and shift...the chain will feel like its not catching onto the lift pins. Chain is slipping on the back of the large chainring.

I have the limit screw set at the limit...any more it will pop the chain off onto the crank.

I have the FD setup as per the Rotor instructions. They mention a "shim" has anyone actually used that?
SRAM Braze-on Front Derailleur washer for compact crank - www.neuvationcycling.com

I had a 53/38 round rings before and that shifted fine.


Thanks!


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PostPosted: Fri Dec 14, 2012 8:41 am 
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Joined: Sat Jun 06, 2009 7:28 am
Posts: 480
Rotor rings are not the best, but if unsure take it to a bike shop.


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PostPosted: Fri Dec 14, 2012 9:07 am 
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Joined: Thu Aug 23, 2007 6:52 pm
Posts: 189
Location: Athens/Greece
This shim saved me... This is doing all the job. Use it and everything will work.... It change the angle of the FD. It solves the problems..

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PostPosted: Sat Dec 15, 2012 12:02 am 
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Joined: Tue Apr 19, 2011 10:07 pm
Posts: 126
I have never had any problems with shifting on my QRings with Red FD. I just recently changed to the 2013 Red FD and it is as smooth shifting as ever. As long as you know how to set up your FD properly then you should have no issues. Once you get it dialed in you will be happy! :D

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PostPosted: Sat Dec 15, 2012 4:30 am 
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Joined: Fri Feb 17, 2012 8:04 am
Posts: 74
Tokyo Drifter wrote:
Rotor ring suck, but it sounds like you don't really know what you're doing. take it to a bike shop.

:mrgreen: :mrgreen: :mrgreen: ...

OMG


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PostPosted: Sat Dec 15, 2012 6:32 am 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
Typical adjustment settings are for the outer cage to be parallel to the big ring, between 1 and 3mm above the big ring. Try this instead:
Raise the cage to 3.5mm above the big ring, and tilt the tail of the derailleur cage about 0.5mm inward. This setup was shown to me by a SRAM insider (Ed, for those in the industry) and although I don't use it all the time (line between rubbing in the big ring and ability to throw it off the outside is a bit tighter), it often does the trick.
If the setup works for you, but as I mentioned it's near impossible to not have the derailleur overshift off the big ring, try bending (straightening) the front part of the outer cage plate a little narrower.


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PostPosted: Sat Dec 15, 2012 8:56 am 
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Joined: Mon Mar 01, 2010 8:07 pm
Posts: 762
Tokyo Drifter wrote:
Rotor ring suck, but it sounds like you don't really know what you're doing. take it to a bike shop.


:roll:
Look here>> Luke 23:34

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