I have 700x25 Bontrager Race X-Lite tires. No flats in the last 4,000 miles or so and I ride on the shoulders a lot. No goatheads where I live so this helps. The other day I pulled a construction staple out of my rear tire that was about 3/8" in almost right in the middle of the tire. It was making a ticking noise on each revolution. I rode about a block or two with it in there trying to figure out where the noise was coming from. No flat resulted. I could hardly believe it. Perhaps I've been blessed by the patron saint of bicycle tires.