About Continental Grand Prix 4000: The Grand Prix 4000 works on every road surface, transforming the demands of different styles of riding and supplies extremely long-term performance. It also achieves expectations in precision and production quality. The new reference standard for racing tyres. The new puncture resistance The all new Vectran breaker belt, developed and patented by Continental, surpasses even the famous puncture resistance of the former leader in this category, the GP3000. The extremely strong Vectran fabrics are more flexible and lighter than all other puncture protection materials. Vectran offers more resistance to cuts than Aramid, is five times as strong as steel and features less weight than a nylon double breaker. It also maintains strength in the wet. The new compound The advanced Activated Silica Compound (ASC) increases the handling threshold for even safer yet faster cornering and reduces the rolling resistance of the Grand Prix 4000. A new anti-cracking formula prevents UV light from damaging the compound and increases the mileage performance. The new tread Features new tread wear indicators to help riders gauge the life of their GP4000 tyre. On the one hand you don't lose mileage performance by prematurely replacing the tyre and on the other you don't risk safety by using the tyre beyond its tread service life The new colours In addition to the popular ground colours, we offer the Grand Prix 4000 in brand new Xserallic colours from the Merck Corporation. For example, the new gold, silver and bronze options serve as an indicator to the medals that were won on Continental tyres at the world championships and Olympic Games. Or would you prefer a deep metallic blue in combination with a silver painted frame?.