the dynasys stuff does not work with road 10 speed levers. The 9-speed XT/XTR/etc RDs works perfectly with the 10-speed cassette and 10-speed levers.
The levers and cassette dictate the number of speeds, not the RD. You just need any RD that is compatible with the cable pull ratio of the levers. The 9-speed RD is, the dynasys is not.
I am running the M772 SGS with Ultegra 6703 levers and Sram XX 11-32 10 speed cassette
Last edited by uspspro; 07-17-11 at 03:27 PM.