Continental Grand Prix 4000: Continental raises the bar with the GP4000. Successor to the GP3000, the GP4000 features a 20% reduction in rolling resistance, lighter weight (just 205 grams for 700C x 23mm), VectranŽ puncture protection, longer wear, anti-aging compound, and tread wear indicators. All Black Grand Prix 4000 tires use Black Chili Compound which improves adhesion to the road, provides lower rolling resistance and lasts longer. Made in Germany.