Continental's Grand Prix 4000 S II boasts Conti's Black Chili rubber compound for low rolling resistance, impressive traction and long wear, making for one of the fastest tires in the peloton. The GP 4000 S II also uses a tough Vectran sub-tread for exceptional puncture protection, while the 330-tpi casing delivers a velvety-smooth ride. If you're looking for the ultimate road tire, you've found it.
Vectran Breaker is a synthetic fiber based on the natural model of spider silk. Processed into a multi-strand thread, it's lighter, more flexible and protects more efficiently against cuts than a comparable nylon layer. It also does not affect the tire's rolling resistance.