The star in the peloton! For the coloured GP 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. The extra special thing about the GP 4000 and GP 4000 S is their puncture protection made from Vectran™ liquid crystal fibres. The patented Vectran™ Breaker reconciles the conflicting goals of low weight, low rolling resistance and top puncture and cut resistance in a fascinating manner.