This begins with the letters “DOT” and indicates that the tire meets all federal standards.
Light truck sizes may be shown in two formats: Note: You may not find this information on all tires because it is not required by law. It is a measurement of how much weight each tire can support. If you change your wheel size, you will have to purchase new tires to match the new wheel diameter.ĩ5H: Load Index This two or three-digit number is the tire’s load index. Radial ply construction of tires has been the industry standard for the past 20 years.ġ5: Rim Diameter This two-digit number is the wheel or rim diameter in inches. R: Radial Ply Construction The “R” stands for radial. Numbers of 70 or lower indicate a smaller sidewall for improved steering response and better overall handling on dry pavement. In general, the larger the number, the wider the tire.Ħ5: Aspect Ratio This two-digit number, known as the aspect ratio, gives the tire’s ratio of height to width in percentage.
LT: Vehicle Type The “LT” indicates the tire is for light truck vehicles.Ģ15: Tire Width This three-digit number gives the width in millimeters of the tire from sidewall edge to sidewall edge.
The “P” indicates the tire is for passenger vehicles. This information identifies and describes the fundamental characteristics of the tire and also provides a tire identification number for safety standard certification and in case of a recall. Federal law requires tire manufacturers to place standardized information on the sidewall of all tires.
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