Chain hitting pivot joint on Rockstar 29er
so helping a friend build a rockstar 29er frame, went and installed the rear derailleur and when in the 11 or 12 tooth rings on the cassette the chain is hitting the pivot joint on the chai stay..
I can back the B screw WAYYY out and almost get it clear but them it's too far out and the chain will skip... any ideas?
What chainrings are you using/ which ring is the chain on in the pic?
Originally Posted by thomllama
The trouble with common sense is it is no longer common
chain rings wont matter, but it's a XTR 960.. in the middle at the time but does it in all of them.. at the picture it's still 3 rings up the cassette.. (14 tooth?)
Originally Posted by shiggy
alspo tried an X0 Derailluer and it was worse even
Long cage, medium cage, or short cage derailleur? Possibly you have too much chain? I have found that in the small chainring/small cog combo the chain will hit on the V2 even with the B tension set correctly but I never use that combo anyway.
Last edited by thomllama; 10-20-2012 at 01:35 PM.
Just trying to help you out
If the B tension screw is set incorrectly and the chain is too long then it could be a problem because I have had the issue on few different bikes. I think you can add some B tension and get it to work. Here are pics of the V2 in the small cog and large cog. In both pics the chain is on the big ring (39) of an XO 2x10 setup.
Check your rear derailleur mounting to make sure the spring stop is resting on the derailleur mount tab. Also try loosing the rear derailleur mounting bolt and turn the derailleur counter clockways about a 1/4" and tighten the mounting bolt. I had this same trouble with a early intense 5.5 and this worked.
that was the first thing I checked.. also made sure that the springs and such were all wound correctly. the X0 is brand spanking new so there's nothing there set wrong.. but I checked it
Originally Posted by doralswheels
ummm from the 2nd photo, the B screw is set tooo far off ... tooth to tooth should be 5-6mm from the jockey to the large ring of the cassette, and Sram's are pretty sensitive to B screw adj.
Originally Posted by craigstr
He did take it home and finished the build with the B set just out like you're image, it's at 11MM tooth to tooth.. he says it rides/works OK, but honestly, not something I recommend as even the very slightest twist to the derailleur hanger and you could get chain in spokes when up on the grannie gear