What does 91h on a tire indicate?
3 Answers
91h on a tire indicates a maximum load capacity of 615kg per tire and a maximum speed of 210km/h under specified load conditions. The reasons for insufficient tire pressure are: 1. Air leakage from the tire valve; 2. Reduced tire sealing performance due to wheel hub deformation; 3. Uneven tire force distribution. The hazards of insufficient tire pressure include: 1. Increased road friction coefficient, leading to higher tire temperatures and potential tire blowouts; 2. Heavy steering wheel, compromising driving safety; 3. Damage to the tire bead. Solutions for insufficient tire pressure: 1. Replace the tire; 2. Rotate tire positions.
I remember when I bought my first car tire, I was completely clueless about the 91H marking, but later I learned a lot. The 91 is the load index, indicating the tire can bear a maximum weight of around 615 kilograms—the higher the number, the greater the load capacity. My SUV uses this to ensure it doesn’t overload when carrying passengers and cargo. The H is the speed rating, meaning the maximum safe speed is 210 km/h. Never exceed this on highways, or the tire may wear out faster or even burst. There are many other symbols on tires, like size and pressure markings—always double-check these when replacing tires, as choosing the wrong ones can affect handling and fuel efficiency. Regularly checking tire pressure is crucial—at least once a month—to extend tire life and ensure driving safety. In short, these small markings may seem simple, but they’re quite critical. Understanding them can help prevent accidents.
As an enthusiast who often helps friends modify cars, I've seen markings like 91H countless times. The 91 refers to the load index, indicating a maximum weight capacity of 615 kg - but remember to calculate based on the vehicle's weight distribution. Too high is unsafe, too low is wasteful. The H represents a speed rating of 210 km/h. If you're into performance car modifications, upgrading to higher speed-rated tires like V or W is common practice, but always match them with your vehicle's specifications. The tire sidewall is actually an information treasure trove - it shows rubber type, manufacturing date (expired tires need replacement), and more. During tire changes, I always remind people not to focus solely on price, but to ensure these indices match your usage scenarios - summer mountain runs and winter snow driving have different requirements. Consulting your vehicle manual for optimal customization is recommended. Understanding these symbols thoroughly leads to safer driving.
