What is the maximum speed of 91H tires?
2 Answers
The maximum speed is 210km/h. 91H is the tire load index, where 91 corresponds to a maximum load of 615 kilograms per tire. H represents the speed rating of the tire, indicating that the maximum speed under specified load conditions is 210km/h. Common vehicle models on the market mostly use H and V ratings, while some high-performance vehicles use W and Y. Tire specifications are symbolic data representing the geometric parameters and physical properties of tires. There are three methods to denote tire specifications: A. Metric (m); B. Mixed metric-imperial; C. Imperial. Imperial tire specifications are often represented by a set of numbers, where the first number indicates the tire section width, and the second number indicates the rim diameter, both in inches. 91H tires refer to tires with a maximum load capacity of 615Kg per tire and a maximum speed of 210KM/h under specified load conditions. Here, 91 is called the load index, which can be referenced against a tire load index chart to determine the maximum load of 615Kg. H is called the speed rating, which, as mentioned earlier, can be referenced against a tire speed rating chart to determine the maximum speed of 210KM/h. The most common identifiers on tires are, first, the tire brand, followed by the tire specifications, and then the load index and speed rating. The speed rating is the maximum speed limit determined during the design and production of the tire after considering various factors and tests. Exceeding this speed can lead to multiple safety hazards. Generally, all-terrain tires (AT) have lower speed ratings compared to highway tires to account for performance on unpaved roads. Load index and pressure. These generally indicate the maximum load and corresponding pressure, with the load measured in "kilograms" and the pressure, or tire pressure, measured in "kilopascals." One side of the tire has rubber strips or blocks indicating the wear limit. When the tire wear approaches about 4mm from this limit, it's time to consider replacement. The so-called three "T"s refer to the three commonly seen identifiers on the sidewall of the tire: Treadwear (wear resistance index), Traction (traction performance), and Temperature (temperature index). These three identifiers are additional to the conventional parameters like size, speed rating, and load rating and can be used to select tires based on their three "T" indices, which are lesser-known to consumers. Besides the model, tires also bear the following common data: Tire cord material: Represented by Chinese pinyin, such as M for cotton cord, R for rayon cord, N for nylon cord, G for steel cord, and ZG for steel radial cord tires. Speed rating: Indicates the maximum speed at which the tire can carry a specified load under defined conditions. Letters A to Z represent certified speed ratings from 4.8km/h to 300km/h. Commonly used speed ratings include: Q: 160km/h; H: 210km/h; V: 240km/h; W: 270km/h; Y: 300km/h. Rim specification: Indicates the rim size compatible with the tire for practical use, e.g., standard rim 5.00F.
As a regular driver who frequently takes long trips, I know quite a bit about tires. The 'H' in 91H tires indicates the speed rating, with a maximum speed of 210 kilometers per hour, which means don't drive too aggressively on the highway. The load index 91 means each tire can bear a weight of 615 kilograms, so it's important to match the tire to the vehicle's load. I remind myself that safety comes first because speeding can cause tires to overheat, increasing the risk of a blowout. Regularly checking tire pressure and wear is crucial, especially in hot summer road conditions. Speed ratings like 'H' are suitable for everyday driving, but if the vehicle frequently travels at high speeds, it's advisable to choose a higher rating like 'V' to avoid premature wear. Tire lifespan also depends on driving habits—smooth driving can extend the replacement cycle.
