The SRAM X.0 derailleur is a 9 speed device not 10. It will work with the 11/34 cassette which is also a 9 speed device. The Shimano Dura-Ace 10 speed shifter is not a 9 speed device and has the wrong cable pull for either the X.0 derailleur as mentioned above, or the 11/34 cassette if used with a correct derailleur.