Pirelli P ZERO Race TUB SL Tire - 700b x 25 / 28 x 26 Tubular Folding Black. P ZERO Race Tub SL is the result of the endless process of research and development a racing tubular that has the same speed and handling performances of its predecessor just lighter. Pirelli replaced the standard latex inner tube with TPU (thermoplastic polyurethane) a cutting-edge material that blends the same qualities of speed and puncture protection of the latex with a significant weight reduction.Features the SmartEVO compound a high performance rubber blend that has been specifically developed to maximize handling and grip performance on both dry and wet roads without compromising rolling resistanceBuilt on a fine 320tpi Corespun casing reinforced with aramid fibers for added puncture protection while delivering comfort and precise handling. The dimension of the casing has been tested and developed for wide modern tubular rimsThe tread and profile take advantage of Pirelli’s extensive motorsport experience: the lightning bolt pattern design features narrow angles at the center of the footprint to promote regular wear and progressive feedback while the wider lateral angles provide solid behavior and responsiveness at the end of the lean