Developed redeveloped and now upgraded with cutting edge rubber compound black chili the continental grand prix 4000s ii folding tyre 700 x 23c offers ultimate grip perfect for race daysr r minimal rolling resistance heightened durability and maximum grip thanks to the black chili compound ensures that the grand prix 4000s ii remains one of the greatest road tyres on the market a vectran breaker offers unrivalled puncture protection at minimal weight meaning each ride is lighter and more