Originally Posted by
Al1943
This part just doesn't sound right to me. If by "chain stop" you mean the low limit screw, I don't see how that adjustment can keep the derailleur from moving the chain from the middle ring to the inner ring. An adjustment to the cable tension could. The inner rail of the derailleur needs to be closer than 2 mm from the chain to keep it from dropping.
The way it seems to work is the cable tension is important to get to the middle ring from either the inner or the outer ring. But to get to the inner ring, the shifter just goes all the way to the inner stop. If the inner stop is not in far enough, the chain doesn't make the shift. If inner stop is too far in, the chain can over shoot and fall of toward the frame. on the Roubaix comp, this is the extremely delicate balance that I could not quite tweek in. But FSA sent m a new middle chain ring, so I will check that out this weekend. Thanks for the reply.