Tufo flexus primus 33 sg tubular cx tyreour elite line is intended for top professional competition is using the most advanced technology and materials to date the proprietary high strength high twist polyamide fibers enable construction of 440 tpi casing treads per inch providing these tires with the most supple qualities and optimal inflation pressures for track road and cyclocross racing top of the line model suitable for most conditions except deep mud unique new self cleaning tread p