What kinds of vehicles are rolling on 325/30ZR19 tires? Think the Porsche 911, Chevrolet Camaro, Mercedes-Benz AMG GT, and other vehicles that are designed to go fast.. If you’re lucky enough to drive one of these, chances are you’re looking for ultra-high-performance tires that up the performance game even more. Just remember that for UHP tires, the tread compound is softer and “stickier” for enhanced grip, meaning they will stiffen in colder weather and shouldn’t be used when temps are below about 45 degrees Fahrenheit.