I save these for my "Big" Century rides or Crit racing. I can't believe how little the rolling resistance is compared to other tires. For me, at 350 watts on a level stretch of local roadway I was able to travel 27 mph. 350 watts with another brand on same stretch of road yielded only 24 mph. And the handling on downhill switchbacks/canyons has my bike riding like it's on rails. Great feel, absorbs road imperfections well-even at 127 psi. I havent flatted on these tires yet but being that I save them for special rides probably accounts for that.