Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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This might help you get a sense of what your problem is.
Picture an elevator.
It hangs from a cable. There are stops at the top and bottom of the shaft to keep it from crashing into the end.
Now picture that the bottom stop is adjustable, and that the elevator rests on it for the basement height (real elevators don't, just an example). So raising or lowering that stop would raise or lower the elevator for the basement stop, but would have no effect anywhere else when the elevator is hanging from the cable.
Therefore, each floor stop position (except the basement) depends on the length of cable spooled out from the top of the shaft.
Now for the top of shaft stop. It wouldn't affect anything, or ever move the elevator. It only comes into play when the elevator is at the top of the shaft, where the stop keeps it from going too far and crashing.
Substitute limit for stop, and you have a decent mental picture of how derailleurs work.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
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Last edited by FBinNY; 03-08-14 at 01:01 PM.