You can mix and match cranks and chain rings I.e. Shimano and Sram but not shifting components. Sram derailleurs w/ Sram shifters, Campyw/Campy, and Shimano w/ Shimano due to the difference in pulling ratios. While you may get them to work, but working smoothly will be another story without the help of an adapter. Then with the extra cost of the adapter, $35.00, you could have gotten the correct component