Originally Posted by Wogsterca
Deraileurs are NOT indexed, only the shifters are, what happens is that the shifter pulls the cable a precise amount for each shift, as long as the limit screws are set properly, and the deraileur moves the correct amount given the required amount of cable pull, then it will work. Shimano and Sram move the same amount, given the same amount of cable pull, and the cog spacing is the same, I don't know about Campy, although if I had a Shimano equipped bike that needed a deraileur and a Campy deraileur that wasn't being used, I would certainly try it. However, if I had a Shimano equipped bike that needed a deraileur, and needed to buy a deraileur, I would buy a Shimano to keep everything matching.
Touche, that was a fabulous response. Unfortunatley, no one is listening. For some reason half *ss fixes and crazy cures seem to rule here. The riders here derive some sinister satisfaction in making things work that shouldn't, myslef included.
Still, in the end,
Originally Posted by Wogsterca
I would buy a Shimano to keep everything matching.
Is good advice that no one will take.
Tim