I'm looking to move to Sram XX, but I don't want to buy a new crank (my Noir is less than 1 year old and an XX crank is around $400). Can I run full XX with my Noir w/34/24 Rotor Q-rings (would drop by rarely used big ring)? Would I have issues w/the XX FD? I realize I'd not fully realize the XX front shifting. Any thoughts? Thanks...

A-Hol