What does 91W on a car tire mean?
4 Answers
91W tires refer to tires that can bear a load of 615kg and support a maximum speed of 270km/h. The following is about the tire speed rating codes: According to the different maximum speeds they can support, tire speed ratings can be divided into different grades from A to Z, with grade A further subdivided into eight different levels from A1 to A8. Generally speaking, the further back the letter representing the tire speed rating is, the better the tire performance. Common speed ratings mainly range from Q (160km/h) to Y (300km/h), and tires with different speed ratings have different applicable ranges: 1. Q-T grade tires (maximum speed 160-190km/h) are suitable for small and compact cars. 2. U-V grade tires (maximum speed 200-240km/h) are suitable for mid-to-high-end cars. 3. W-Z grade tires (maximum speed 240-300km/h) have better performance and are therefore more commonly used in large luxury cars and supercars.
That 91W marking on the tire means this tire has a load index of 91, indicating each tire can bear a maximum weight of 615 kilograms. The letter W is the speed rating symbol, showing the tire's designed maximum speed reaches 270 km/h. You must check this matching when buying a car or replacing tires, because if the load capacity is too low, the tire may burst under heavy vehicle weight, and insufficient speed rating significantly increases risks during highway overtaking. Before long-distance drives, I always check all tires' air pressure and wear to ensure the markings are correct and untampered, which also improves fuel efficiency. Remember to be extra cautious with speed control on icy winter roads - don't just rely on the markings to speed. Safe driving is paramount. Regular tire maintenance can extend service life and reduce sudden failure risks.
As someone who frequently pays attention to automotive details, I find the combination of letters and numbers "91w" quite fascinating. It can be interpreted in two parts: the number "91" is a load index, meaning this tire can withstand a load of over 600 kilograms. The letter "w" is a speed symbol, indicating a maximum speed of 270 km/h. When driving, if the car is overloaded with too much cargo, the tires are prone to fatigue and rupture. Similarly, when driving at high speeds, it's essential to ensure the tire rating matches to avoid poor handling and increased fuel consumption. I usually make it a habit to check the tire pressure in the garage to maintain proper levels, which helps prevent accidents and enhances driving pleasure. Remember, in different seasons, such as during hot summers, the internal tire pressure rises, so timely adjustments are necessary to avoid the risk of a blowout. When replacing tires, always refer to the vehicle manual and avoid opting for cheap alternatives without consideration.
In my opinion, the 91W on the tire indicates load capacity and speed limit. 91 refers to a maximum load of approximately 610 kilograms, while W denotes a top speed of 270 kilometers per hour. When driving an ordinary family car, this marking helps us avoid dangers. For example, when moving household items, don't overload to prevent excessive tire pressure. On highways, don't exceed the speed limit to ensure stability. When I drive my small car to pick up my kids, I always pay special attention to tire pressure checks—after all, safety is no trivial matter. From another perspective, think of the tire markings as your protective shield. Proper maintenance can extend their lifespan by several years.
