Continental grand prix road tyre 23c pairthe name grand prix has become a brand of its own in cycling circles worldwide these are the original tyres from which the famous gp4000 s ii originated this pair of grand prix road tyres now sit below the gp 4000 s ii in the range at a different price point offering 180tpi casing poly x anti puncture technology and a blackchili compound all of these components ensure that cyclists using the grand prix can be sure of race winning technology feature