How to identify the specifications of car tires?
The speed rating indicates the maximum speed at which the tyre carries the specified load under specified conditions.The commonly used speed rating: Q 160 km / h V 240 km / h R 170 km / h W 270 km / h S 180 km / h Y 300 km / h T 190 km / h H 210 km / h Z ZR faster than 240 km / hour, if there is ZR, such as P275/40ZR17 93W, then the highest speed rating ("93W" in "W") is 270 km / h.
The tire specifications are usually represented by a set of figures. The first figure represents the width of the section of the tire, and the latter represents the diameter of the rim, in inches. For example, 165 / 70R14 represents a tyre width of 165 mm, a flat rate of 70, and a radial tire of 14 inches in diameter. Some tires also contain other letters or symbols that have a special meaning: "X" means a high-pressure tire; "C" indicates an enhanced type; "B" indicates an oblique tire; "1" represents a low-pressure tire. M and S are abbreviations in English, Mud and Snow, which indicate that this kind of tire is suitable for use on ice and muddy roads. Some tires have an arrow or OUTER SIDE on the wall, which indicates the direction of the wheel's rotation. If a small umbrella sign is painted on the tire wall, it shows that the tire is suitable for traveling on rainy or slippery roads. The DOT mark indicates that the tire has passed the certification of the United States and Canada * * * transport department. Behind the DOT mark is usually followed by a 4 digit number, and unlike other text, it is not an early die, but it is later pressed on the tire, such as (0518), which means the date of production of the tire.
The most common marker of radial tire shape: 215 / 70R15, the meaning of these figures are: 215 said tread width, the unit is mm, the general tire width in the interval between 145 - 285mm, 10mm; 70 is flat ratio, namely tire wall height and tread width ratio of 70 represents 70%, general tire flat than in 30% - 80%, under normal circumstances, ordinary cars should not use more than 75% flat tires, luxury cars and high performance cars less than 60% of the recommended flat tire; R is the abbreviation of Radial English, said tire radiation layer structure, the 15 is the outer rim inches. If some tire marks like: 6 - 12, which indicates that it is not radial tire, but tire, the tire in the car now has been very rare, because of its safety, load capacity and high stability, and only used in some low-grade off-road vehicles and heavy trucks.
