Went to a neat presentation at our local library. 3 fellows rode cross country from West to East. Had interesting slide show. The amazing thing is that between the 3 riders over 3800 miles they encountered no flat tires! Broke half a dozen spokes but no flats. No special tires or tubes either.
I have had 3 flats in a 15 mile ride so over 7600+ miles of riding no flats seems almost unreal. They did a 2 days riding and 1 day of support truck rotation.