We purchased two identical new Pirelli P Zero P245/35/ZR20 91Y tires and had them professionally installed. The mechanic noticed that after installation one of the tires pulled hard to one side. The vehicle was aligned but the issue persisted, so they moved the tire to the other vehicle side. Now the vehicle pulled to that side, at which point we were told the problem was the tire, either a belt separation or other internal tire manufacturing defect. They suggested we contact the manufacturer and get a warranty replacement tire. We have been trying for weeks to get a replacement tire sent out from Pirelli, but they have been unwilling to work with us.