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What are the classifications in the automotive tire grading table?

2 Answers

EmeryAnn

07/30/25 2:52am

Tires use letters from A to Z to represent the certified speed ratings ranging from 4.8 km/h to 300 km/h. The number before the tire specification indicates the tire section width, and the one after represents the rim diameter in inches. Some letters on tires have additional special meanings: "B" denotes bias-ply tires, "C" stands for reinforced tires, "-" indicates low-pressure tires, and "X" signifies high-pressure tires. Specifications: Tire specifications are represented by a combination of numbers and letters printed on the sidewall. The first number indicates the tire section width; the second number represents the aspect ratio; the following letter denotes the tire construction; the next number refers to the rim diameter; and the final number and letter represent the load index and speed rating, respectively. For example: 175/65R15 86H indicates a tire width of 175 mm, an aspect ratio of 65, and a rim diameter of 15 inches. The letter or symbol between the aspect ratio and rim diameter is most commonly "R," which, like "Z," signifies radial tires. Others include "X" for high-pressure tires, "-" for low-pressure tires, and "B" for bias-ply tires. Speed: Speed ratings indicate the maximum speed at which a 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: P-150 km/h; H-210 km/h; 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; Z-ZR for speeds above 240 km/h; and ZR if the tire specification includes ZR in the description.

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McMariana

08/16/25 9:12am

Let's talk about tire rating tables, there are several common ones to understand. The speed rating table uses letters to indicate the maximum allowable speed of a tire, for example, T stands for 190 km/h, and H is 210 km/h—safety at high speeds depends on it. The load index table uses numbers, such as 91 indicating a maximum load capacity of 615 kg, preventing overloading that could lead to blowouts. The UTQG (Uniform Tire Quality Grading) table includes the Treadwear (wear resistance index), Traction grade, and Temperature grade, marked on the tire sidewall, telling you about lifespan and safety performance. For example, Traction is divided into grades A, B, and C, with grade A being the most reliable for braking in the rain. Don’t forget that some regions also have the EU label table, covering fuel efficiency and wet grip, with arrow counts showing fuel-saving effects. Before daily driving, a quick glance at these tables ensures you pick the right tires.

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