What does 91W on tires mean?
2 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 functions of tires are: 1. Transmitting driving force, braking force, and steering force to achieve vehicle operation; 2. Supporting vehicle loads; 3. Reducing and absorbing vibrations and impacts during driving to avoid severe vibrations damaging vehicle components. Tire maintenance methods include: 1. Regularly cleaning stones from tire treads; 2. Minimizing exposure to sunlight; 3. Promptly checking tire pressure; 4. Paying attention to suspension maintenance; 5. Regularly inspecting front wheel alignment; 6. Adopting careful driving habits, choosing smooth road surfaces, avoiding objects that can puncture or scratch tires, and steering clear of chemical spills that may corrode tires.
I've been in the automotive repair industry for many years and have seen too many accident cases caused by ignoring tire codes. 91W refers to the tire's specification parameters - 91 is the load index, indicating the maximum safe weight a single tire can bear is 615 kg, while W is the speed rating, meaning the tire's designed maximum safe speed is 270 km/h. These aren't just random numbers; they're core to driving safety. If you drive an SUV carrying heavy loads exceeding the weight limit, the tires can easily fatigue and burst; when speeding on highways beyond the W rating, overheating tires will wear rapidly or cause accidents. I always remind vehicle owners to match new tires with their vehicle manual's recommended specifications and regularly check tire wear and pressure. Ignoring this could mean needlessly spending more on tire replacements at best, or affecting braking performance and causing disasters at worst. Don't think these small numbers are insignificant - they're crucial for your safety.
