Originally Posted by
Black Sunshine
There are Shimano derailleurs that are compatible with SRAM shifters. I guess first you need a bracket. Get one of those and hang the original derailleur back up and see if it's still functional. If it is then you'll be good to go. If not then just get another one that is SRAM shifter compatible.
Actually, it's the other way around: some *SRAM* shifters are compatible with Shimano rear *derailleurs*, while other SRAM shifters are compatible with SRAM rear derailleurs. The SRAM ESP system shifters and derailleurs use a 1:1 cable pull ratio, while Shimano uses a 2:1 cable pull. Thus, if you've got an SRAM RD, almost certainly you'll need another SRAM RD to replace it.