The Cannonball 32in Tubeless Tire runs a Superstructure casing upgrade, packing extra-fine, hardened nylon fibers into the Light & Supple casing for real puncture and sidewall protection without piling on weight. A Fast Plus compound keeps rolling resistance low, so the added protection doesn't cost the tire its speed. What Our Gearhead(R) Experts Are Saying:"I rolled straight over a patch of sharp gravel mid-race that would have flatted a lighter tire, and never felt it in the sidewall. The tread still carried speed on the smoother sections without any drag."