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What does the tire size 205/55R16 91H mean?

1 Answers

AliyahDella

07/29/25 10:11pm

205 represents the tire's section width of 205 millimeters, 55 represents the tire's aspect ratio, R stands for radial tire, 16 indicates the rim diameter of 16 inches; 91 is the tire's load index; H represents the tire's speed rating. Tire size specification example (taking 195/55R15 as an example): 195 is the section width, which is the area of the tire that can contact the ground, measured in millimeters; 55 is the tire aspect ratio, which is the ratio of the tire's section height to section width. R is the construction mark, with R being the abbreviation for radial tire, while bias-ply tires are represented by the letter "B". Passenger car tires are generally radial tires. 15 is the tire's inner diameter, also known as the wheel diameter, usually measured in inches. Tires also have speed rating letter markings, indicating the maximum speed at which the tire can carry a specified load under defined conditions. Letters from A to Z represent certified speed ratings ranging from 4.8 km/h to 300 km/h. Common speed ratings include Q for 160 km/h, R for 170 km/h, S for 180 km/h, H for 210 km/h, V for 240 km/h, and W for 270 km/h. Precautions for replacing car tires: When selecting tires, the specifications should be the same as the previous tires and must match the other tire on the same axle, such as speed rating, load index, tread pattern, brand, size, etc., to ensure safe driving. The valve stem should also be replaced because after changing tires, the aging cycles of the new tire and the valve stem differ. During the new tire's lifespan, the valve stem may develop issues, which are not easily noticeable. Therefore, it is best to replace the valve stem when changing tires. Installation direction and inflation: If using the original equipment tire, follow the manufacturer's installation requirements. For non-original tires, generally, the side with the production date should face outward. If it is a directional tire, align the arrow on the wheel with the car's forward direction during installation. During inflation, you can fill the tire to the maximum allowed pressure and then reduce it to the manufacturer's specified standard pressure.

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