Kenda Booster Pro Tire - 700 x 40, Tubeless, Folding, Coffee Sidewall, 120tpi, GCTThe Booster is a World Cup proven XC race tire that is aggressive enough to push traction to new limits. On top of that, it is also one of the fastest and lightest XC tires on the market. You no longer want to choose between a XC tire that is either fast and light, or provides great traction? The all new Booster combines the best of both worlds. Gravel Casing Technology (GCT) is a versatile casing with great all round puncture and slash protection.