Continental 0118498 Grand Prix 4000-700 x 23 Black and Transparent Tire with Black Chili is one of the few tires that miraculously delivers on all fronts. For the colored Grand Prix 4000 tires, the activated silica compound improves the handling at stability limits and gives great rolling resistance. The anti-tear formula in the rubber compound prevents tread brittleness while increasing mileage performance. Xirallic colors give your machine a look of stylish elegance. The extra special thing about the GP 4000 and GP 4000S is their puncture protection made from Vectran liquid crystal fibers. The patented Vectran Breaker reconciles the conflicting goals of low weight, low rolling resistance and top puncture and cut resistance in a fascinating manner. The material is extremely tear and cut resistant and is also flexible. It retains these properties even under constant stress. The new Black Chili material incorporates rubber compound particles roughly ten times smaller than what is typically used in bicycle tires. This creates a denser rubber, without adding more material. Denser rubber increases a tires ability to conform to the road, while also increasing durability. The Black Chili compound is also more resistant to UV rays, which contribute to cracking and premature tire wear. The Grand Prix tires also come equipped with tire wear indicators so the rider knows when to swap out tires. Specs: Color - black/transparent skin foldable; Black Chili - yes; Weight - 205 grams; Recommended PSI - 110; Maximum PSI - 120; PU - 10.