Originally Posted by
imobilinpedalus
It does not seem like shifters in general have that specific specification listed, so how would i know what cable pull they have?
Ah yes, the infamous B screw. I was hoping that would solve the puzzle at least for some.
I think he's talking about the screw that prevents your derailleur from being destructively shifted into the spokes. I'm guessing you are referring to the screw that adjusts preload of the upper or lower spring-loaded pivot. It affects how much clearance there is between the upper jockey wheel and the largest rear sprocket, and more generally, the free length of chain.