The Grand Prix 4000 S II is the reference tyre in the road bike market and has gone through numerous stages of evolution. Our flagship tyre now gets a facelift! The discreet bead strip allows us to colour coordinate the tyre to match your bike perfectly without losing the BlackChili tread performance. We have also expanded the size range with an additional 28 mm version added. This provides improved grip in poor riding conditions, increased puncture protection and greater comfort. The proven aspects of the 4000 S II remain unchanged. Vectran Breaker for unsurpassed puncture protection, advanced BlackChili Compound for low rolling resistance and sensational grip, and handmade in Germany of course! Vectran is spun from Vectra liquid crystal polymer, which results in a thread that is thermoplastic and has multifi laments. This semicrystalline material is harder then aramid, has five times higher tensile strength than steel and in addition, is also lighter than comparable nylon thread. Vectran maintains these attributes even in the most adverse weather conditions.