I'm in the process of building my 2012 Specialized Camber Expert & have come to a halt due to the confusing direct mount on the frame. I have tried to mount E2, S1 & S3 derailleurs with no joy, the gears ar mainly Sram x9, Xo combo (shifters & rear mech) running a 2x 10 speed set-up. I have got hold of a bottom bracket derailleur mount which will take either E2 (XTR) or Sram XO S1 derailleurs. Has anyone else had trouble finding a front mech to fit this frame?