I weigh ~150lbs. I've currently got 700x23c Vittoria Diamonte Pros at ~100psi(Minimum recommended pressure on the side of the tire.) My thought is that a larger volume tire will allow me to run a fairly soft tire pressure ~80-100psi while still giving me the tire volume to not pinch flat if I go over a large crack, etc, in the concrete. And hopefully absorb smaller bumps in the pavement as well making the ride smoother in general. I assume that's basically how the whole thing works with larger volume tires being a smoother ride?