Khaberni - Modern car tires include symbols and letters on their sidewalls, revealing important information about tire size, allowable pressure angle, load index, and even the tire's lifespan. Among these symbols, the ZR code captures the attention of drivers, especially those who are focused on their vehicle's performance at high speeds.
The letter R usually indicates that the tire is made with radial tire technology, which is the most common technology in modern tires. The appearance of the ZR code signifies the tire's speed rating or what is known as the speed index, i.e., the maximum speed the tire can withstand at optimal pressure before it might suffer any potential damage.
ZR-rated tires are specifically designed for sports cars and powerful vehicles, as they can handle speeds exceeding 149 miles per hour, which is approximately 240 kilometers. This category includes the sub-ratings W and Y and **(Y), where W-rated tires can reach 168 miles per hour, Y** rated up to 186 miles, while (Y) surpasses speeds of 186 miles per hour, according to slashgear.
Car experts note that the speed rating on a tire is usually determined by looking at the numbers and letters after the letter R on the sidewall of the tire. The first figures represent the rim diameter, while the last figures represent the load index, and the letter immediately following the load index directly represents the speed rating.
However, the ZR symbol is not a completely independent rating and appears differently depending on the manufacturer. Some companies, like Michelin and General Tire, add the letter Z before R, while others like Bridgestone ignore it. If the speed rating is (Y), the letter Z is always listed according to industry standards, and the load index is printed inside parentheses, like ZR17 (95Y).
Studies indicate that ZR-rated tires are primarily designed for sports cars. For instance, the 2024 Corvette reaches a top speed of 194 miles per hour and uses Michelin Pilot Sport All Season 4 tires rated (Y). Likewise, high-performance SUVs like the Lamborghini Urus use Pirelli P Zero tires rated (Y) to reach speeds of 190 miles per hour.
Conversely, experts explain that regular car drivers usually do not need to upgrade their tires to ZR rating, as lower-rated tires such as T, H, and V suffice for everyday use, including long trips. It is advised to always comply with the speed rating recommended by the vehicle manufacturer, found on the tire label or in the owner's manual.
Specialists confirm that the tire's speed rating does not imply an invitation to drive at high speeds on public roads. It is always necessary to respect the speed limits set by local authorities and consider safety, road conditions, and weather.
