The gp 4000s ii tubular road tyre from continental is a road tyre ideal for touring or racing it comes with a facelift of the renowned 4000s clincher tyre and a seamless casing design the seamless casing improves seating on the rim tyre uniformity and rolling resistance it uses continentals advanced blackchili compound for low rolling resistance high mileage and maximum wet weather grip it uses a vectran breaker for maximum puncture protection and now comes in a 28 x 22mm size black on