Quote Originally Posted by dgw2jr View Post
Some SRAM stuff is 1:1 actuation ratio. Not compatible with Shimano stuff.
Everything X4 and above is 1:1 and not compatible with Shimano shifters.

Cassettes, chains, cranks, and front derailleurs are interchangeable between SRAM and Shimano, so long as they're the same speeds (7, 8, 9, 10 - but not 11).