Continental grand prix 4000 tubular road bike tyreas the tubular version of the world leading clincher tyre the grand prix entices professional cyclists with its new technology a seamless casing design improves the rim seating uniformity and rolling resistance the name the dynamic tread design and of course a vectran puncture protection breaker state the high ambitions of this tyre also includes the innovative blackchili tread mixture what will you fit to your carbon road wheels specific