The Pirelli P-Zero (PZ4) 255/35R21XL is a high-performance summer tire designed for use on passenger vehicles, SUVs, and light trucks. The tire features an asymmetric tread pattern that provides excellent grip and handling in both wet and dry conditions. It is designed to provide maximum performance when used on sports cars and high-performance vehicles. The PZ4 also features a reinforced sidewall that helps to reduce road noise and improve comfort.