I have a 2011 Specialized Epic Elite and it has a Sram x7 front derailleur. It is junk i was at Saw Wee Kee Park mountain biking last weekend and it would not shift from first to second gear for it life. it was so slow and hesitant it would not shift it took way more effort than it should I just gave up. On my Epic i am going to buy a Shimano XTR front derailleur to match my rear. I have a question which one do I buy my Derailleur is mounted with a hex type bolt to the frame itself. there is no clamp that goes around the tube. which one do i buy? Thanks Guys!