I ride with them a couple of years. First on my old bike after 5500 miles no flats. After that, no idea I sold the bike. The new bike got a pair of continental travel contact light, after 3000 miles and 5 flats I got a set of supremes. The lasted 7000 miles with 3 flats, all in the last 700 miles. The current set has 4000 miles on them no flats. Nothing but good about the tires from me. Our roads (and bikepaths) are pretty clean, the occasional glass in the town center but not to brutal.