Continental grand prix 23c folding road tyrethe name grand prix has become a brand of its own in cycling circles worldwide this is the original tyre from which the famous continental gp4000 s ii originated the grand prix offers many of the benefits of the gp 4000 s ii but at a lower price point it stands for incredible value for money it features a 180 tpi casing poly x anti puncture technology and a blackchili compound all of these components ensure that cyclists using the grand prix can b