I'm not happy with the Shimano rear derailleur on my bent. I mean it works, but SRAM derailleurs work better and need less maintenance. Trouble is, I need to keep my XTR dual control levers, because no other alternative works as well for me (they're mounted upside down on a USS handlebar).
So I was thinking of mounting a SRAM derailleur, and machining an adapter like the Jtek ShiftMate (http://www.sheldonbrown.com/harris/shiftmate.html) but to convert the cable pull from Shimano to ESP, and mounted very close to the shifter instead of the derailleur. However, I googled long and hard but I seems to have trouble finding out the actual cable pull for each standard : I seem to vaguely remember reading somewhere that Shimano's 2:1 ratio is really 1.7:1, and from what I could gather, ESP is really 1:1, but I'm not sure.
So does anybody know what the real ratios are for Shimano and ESP?