The GP4000S offers Continential's brand new Black Chili rubber compound which was first developed for the Moto GP motorcycle circut.
Continential put more molecular level carbon into the butyl rubber which reduces rolling resistance 26%, increases grip by 30% and increases mileage by 5% - they're Faster, Grippier and Last Longer! The GP4000S has a a dynamic siped tread pattern with a Vectran layer sandwiched in place for added flat resistance. 205 g. 330 tpi. Available in 700x23.