Old 04-23-14, 09:18 AM
  #14  
twocicle
Clipless in Coeur d'Alene
 
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Join Date: Mar 2012
Location: Coeur d'Alene, Idaho
Posts: 1,996

Bikes: Tandems: Calfee Dragonfly S&S, Ventana ECDM mtb; Singles: Specialized Tarmac SL4 S-Works, Specialized Stumpjumper Pro, etal.

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Originally Posted by Al1943
The high limit screw should keep the chain from dropping to the outside of the big ring if the front derailleur is low enough. It should be as low as possible without actually binding against the chain.
It would be best to make the shift up to the big ring with the chain running on the outside hailf of the cassette.
Yes, limits screws are set to the minimum - just far enough to eliminate rubbing the chain. That is not stopping the chain from catching on top of the ring teeth and walking off the outside. This "over shifting" seems to be only occurring when the chain angle is greatest (inner half on cassette, then shifting from granny to big ring) and when the chain is skating on top of the teeth. When the chain drops properly into the teeth valleys there is no problem.

I've ordered some Stronglight rings from xxcycles.com to try out next. Had thought of grabbing a FSA Pro Road 48T outer ring which is supposed to be ramped and pinned (unlike the TA which is only pinned), but I opted to get a selection of Stronglight rings in a few sizes... 50,48T - CT2 version of big ring and 30,32,34T grannies.

Last edited by twocicle; 04-23-14 at 04:12 PM.
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