“R” and “ZR” are terms used to describe the construction of tires for high-performance vehicles.
“R” stands for “Radial,” which is the most common type of tire construction. Radial tires have a layer of cords running perpendicular to the tread, which allows the tire to flex more easily and provide better handling and ride comfort.
“ZR” stands for “Zero-Rated,” which is a designation given to tires that are rated for speeds in excess of 149 mph. These tires typically have a more aggressive tread pattern and stiffer sidewalls, which allows them to handle high speeds without losing stability.
In general, ZR tires are designed for high-performance sports cars and are not recommended for everyday driving. They may have shorter tread life and may be more expensive than regular “R” tires. It is important to check the owner’s manual or consult with a professional mechanic to determine the appropriate tire for your vehicle.