Not possible with stock Shimano 6700 cranksets. FC-6700 did 52/39 and 53/39. FC-6703 triple is 52/39/30, and the compact crank FC-6750 is 50/34. You could get a different front crank that had 54 teeth. What is your reason for wanting a 54 up front?

Dura ace 7900 will bolt straight on.

Some of the TT, Du, and tri courses in my area have some longer downhills that I spin out on. Portions are steep enough to tuck, but I'm thinking a 54/55 would let me pedal through most of it without spinnning at 106+.

53x11 @ 106RPM: 39.97MPH
54x11 @ 106RPM: 40.72MPH
55x11 @ 106RPM: 41.47MPH


55x11 @ 100RPM: 39.12MPH

I find that when I spin out in 53x11... it's time for a coasting break. :)

But it's cool to know that the Dura Ace ring will bolt right on your 6700 crank.