The Continental Grand Prix 4000 works on any road surface, its activated silica compound improves the handling at stability limits and offers excellent rolling resistance. This tyre provides long-term performance and precision production qualities.
The Vectran breaker belt is made from an extremely strong fabric that's more flexible and lighter than other puncture protection materials. Vectran's anti-tear formula stops tread brittleness and increased mileage performance. Five times as strong as steel, Vectran is a lightweight nylon double breaker that remains strong in wet conditions.
Tread wear indicators ensure riders can measure the life of the GP 4000 tyre. This ensures riders won't lose mileage performance by replacing the tyre too soon, and you won't use the tyre beyond its tread life. - A.D.
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Just like the clincher, these are smooth fast rolling, and fairly puncture resistant, a big Plus being their great grip which considering safety, rates highly for me. I did not want to have to worry about punctures on Tubulars. There are lighter tubulars but often guys will run glue to help prevent or assist in puncturing, but that adds 30gsm to your tyre. So I figure don't bother or what's the point getting a vittoria CX and running glue to make it the same weight as this. Better to have a great tyre with good puncture resistance and outstanding durability than something like the CX which is shot after 500kms of racing. that's a personal choice though. So far I have done about 5000km of racing / riding and only had one puncture. I generally use these for a years racing approx 1200km's then I change them to my trainers to get monies worth and for practice and confidence dealing with tubular fixing.