Conti's Grand Prix 4000 ups the ante in high-tech road tires. The smooth center tread rolls fast and the tread pattern on the shoulders maximizes cornering traction. Continental's Black Chili Compound tread provides lower rolling resistance with outstanding handling and cornering. Tread-wear indicators show the wear rate of the tire, eliminating guessing. And, the ultimate highlight is the introduction of Vectran. This polymer membrane offers excellent puncture protection and reduces rolling resistance, all at a race-ready weight.