Pirelli P ZERO Race 4S Tire - 700 x 26 Clincher Folding BlackPirelli P ZERO Race 4S Tire 700 x 26 Clincher Folding Black. P ZERO Race 4S is the successor of the famous P ZERO Velo 4S: a further evolution of Pirellis best selling all season tire. The new SmartEVO Compound enhances performance on wet and cold tarmac while the new TechBELT construction continues to provide the handling and racing feeling that made the P ZERO family famous all over the world. A slightly thicker tread improves the mileage of the