![]() However, light trucks are not designed to travel as fast as passenger cars, so they often have lower speed ratings (often ranging between N and H). Light truck tires use the same single-letter speed rating system as other tires. In the example above, the load index is 97, while the speed index is V. The load index is a two or three digit number, while the speed index is a single letter at the very end of the entire size code. The load index and speed index show up together as the last part of the tire size code. Difference between speed rating and load index ![]() The speed rating should never be taken as the safe maximum speed of your vehicle, or as a recommendation that you should travel faster than the legal speed limit. The actual safe driving speed depends on many other factors, such as laws, weather and road conditions, and your car’s mechanical capabilities and condition. If a tire is old, worn down, underinflated or overloaded, the speed rating is no longer relevant. The speed rating essentially reflects the ability of a tire to withstand or dissipate heat at high speeds. Running a tire at speeds higher than its rating can shorten the tire’s life and potentially lead to a tire damage which could result in an accident, so it is important to follow the manufacturer’s speed rating recommendations when you are choosing tires.
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