Ultra High Performance RadialOriginal Equipment on 2005 Lexus GS350Ultra High Performance Summer tires are for driving enthusiasts who want a combination of a performance appearance, crisp handling and Z-speed rated (or higher) durability along with dry and wet traction. Often used as Original Equipment (O.E.) on sports cars, performance coupes and high performance sedans, Ultra High Performance Summer tires are not intended to be driven in near-freezing temperatures, through snow or on ice.