What does 91h on a tire indicate?

[GabrielaLynn]

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.

[Willie]

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.

[DelClayton]

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.

[LiamDella]

From a safety perspective, the 91H marking must never be ignored. The number 91 represents a load index of 615 kilograms—exceeding this limit means insufficient tire support, increasing the risk of losing control during sudden braking or sharp turns. The H speed rating indicates a maximum of 210 km/h; driving faster can cause tires to overheat and deform, especially during high-speed maneuvers or emergency lane changes. Regular tire inspection is a crucial part of maintenance—ideally, visit a professional shop every six months to check for wear and aging signs. If abnormalities are detected, replace the tires immediately without cutting corners, as tire-related accidents often lead to severe consequences.