What does 91W on the tire mean?
3 Answers
Tire 91W refers to the load index of the tire, indicating that the maximum load capacity of a single tire is 615 kilograms, and the maximum speed it can withstand is 270 kilometers per hour. The following is a relevant introduction to car tires: The function of tires: Tires transmit driving force, braking force, and steering force to achieve vehicle operation, support vehicle loads, and reduce and absorb vibrations and impacts during driving, avoiding severe vibrations that could damage car components. Tire maintenance methods: Regularly clean stones from the tire treads, minimize exposure to direct sunlight, promptly check tire pressure, pay attention to suspension maintenance, regularly inspect front wheel alignment, and be mindful of driving habits. Choose smooth road surfaces while driving, avoid objects that could puncture or scratch the tires, and steer clear of chemical spills that could corrode the tires.
When I bought tires before, I also pondered this. The '91' in 91W is the load index, meaning a single tire can bear a maximum of 615 kilograms. As for the 'W', it's the speed rating, indicating a safe top speed of 270 kilometers per hour. Car manufacturers always recommend these numbers in their manuals, and you must never ignore them because using the wrong tires could lead to a dangerous blowout at high speeds. For daily driving, you should check tire pressure and wear. Low tire pressure increases the burden on the tires. Before changing tires, I suggest checking your car's specifications first. Don't just go for attractive tread patterns—safety is more important than anything else. I learned this the hard way.
After driving for over a decade, I've seen plenty of tire issues. The 91W marking - the 91 refers to load capacity (91 means about 615kg), overload it and the tire wears out fast. W is the speed rating, max 270km/h, never exceed that on highways. A friend told me about someone who cheaped out on mismatched tires - they wore through at just 120km/h, costing a fortune in repairs. Remember to visually inspect tires regularly, especially before long trips - check tread and shoulders, maintain proper pressure. Always match OEM specs when buying tires, don't penny-pinch your way into trouble.
