Ok, with all the manufacturers seeming to change their cable pull ratios at random, I wonder if anyone has ever put together a chart of cable pull ratio? It's hard to dig this info up as a layperson but everything from 9 to 10 to 11 and between mountain and road seems to have all sorts of pull ratios available so one is never certain if one derailleur will interchange with another even of the same brand. Is this something that exists out there?