Pirelli P Zero (PZ4) tires are high-performance summer tires specifically designed for exclusive and high-performing vehicles. They were initially introduced as Original Equipment on certain car models, including Audi, Lamborghini, and Porsche. These tires are available in both replacement sizes and original equipment fitments. It's important to note that the warranty does not cover tires that develop compound cracking in temperatures below 45° Fahrenheit (7° Celsius). Therefore, these tires should not be used, stored, or driven in near-freezing temperatures, or in snowy or icy conditions. Each Original Equipment P Zero (PZ4) tire is customized to suit the specific requirements of the vehicle it is designed for. The tread compound is made from a special mixture of silica and carbon black, which can be adjusted based on the vehicle manufacturer's needs. This allows the tires to provide the desired combination of wet and dry grip, handling, comfort, tread life, and fuel economy. The tread design is asymmetric, with the outer shoulder designed differently for sports cars and luxury vehicles. For sports cars, the focus is on dry handling, grip, and stability, while for luxury vehicles, the emphasis is on comfort, noise reduction, and resistance to hydroplaning. Non-original equipment P Zero (PZ4) tires feature the sports car outer shoulder design, and all versions have wide circumferential grooves for efficient water evacuation and resistance to hydroplaning. The internal structure of the P Zero (PZ4) tires consists of twin steel belts reinforced by a hybrid nylon and Kevlar cap ply. The construction of the tire casing varies depending on the desired performance characteristics of the original equipment. This customization allows the tire designers to further refine the tire to match the specific characteristics of the vehicle it is engineered for. It's important to mention that limited sizes of the P Zero (PZ4) tires are available with Pirelli's Seal Inside technology. This technology involves an adhesive sealant that coats the base of any embedded object, sealing the punctured area and preventing air pressure loss. This allows the vehicle to continue operating without experiencing a flat tire. Additionally, some sizes of the P Zero (PZ4) tires are equipped with Pirelli Noise Cancelling System (PNCS), which reduces cabin noise by applying a layer of sound-absorbing foam to the inner liner of the tire. The sizes with these technologies are clearly identified in the specifications and search results.