I'm building a Tarmac SL3 and would like to run the new 11 speed Dura-Ace group with an existing crankset. I have an S-Works compact crank and I haven't been able to find any info on whether old chainrings would work ok with the Dura-Ace 9000 drivetrain. Should the Specialized chainrings work? If not, are there rings I could put on it that would? I know the Dura-Ace crank would be much better, but it's not in the budget at the moment.