I ran Pro Race tires on my road bike, and I've got a conti and an avocet on right now. No flats, but I don't ride on gravel. I'm considering leaving the CX tires on when I get my Fuji Cross and making my commute to work into a cyclocross commute so I can just roll over the gravel and jump off the bike and run with it if I need. Oh man this thing is gonna be sweet!