I've read that SRAM/Shimano shifters/front derailleurs are compatible, but for some reason I no longer have trim while in the big ring. I don't exactly need it, but it's making me wonder if it really is fully compatible or not. I may just get a 31.8 Ultegra FD, since the one I have is a braze-on, but I was curious if anyone else has had a similar experience.