What Do the Markings on Car Tires Mean?

1 Answers
Norman
07/30/25 4:32am
Car tire markings refer to the meanings of various symbols on the tire. These include the tire's specifications, load rating, rim size, speed rating, and more. Below is a detailed explanation of tire markings: 1. Specifications: Tire specifications are often represented by a set of numbers. The first number indicates the tire's section width, and the latter denotes the rim diameter, measured in inches. For example, 165/70R14 means a tire width of 165 millimeters, an aspect ratio of 70, and a rim diameter of 14 inches. The letters or symbols in between have special meanings: "X" indicates a high-pressure tire; "R" and "Z" represent radial tires. 2. Speed Rating: 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.
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