Two road bike tires and two inner tubes arrive together in the Zaffiro Pro V Clincher Tire and Tubes Set, so both wheels get a full refresh at once. The Zaffiro Pro V is a performance-oriented training tire with Vittoria's Graphene 2. 0 compound and a tread of center grooves and textured sides that add grip. The butyl tubes carry Presta valves and a 0. 9-millimeter wall that stays durable without adding bulk. What Our Gearhead(R) Experts Are Saying:"I changed front and rear in one sitting because both tires and both tubes came in the same box, so there was no second trip for tubes. I rolled out that same afternoon."