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Tire Sizing

Light Truck Tire Sizing

Light Truck Numeric

Passenger & Light Truck Tire Sizing - Light Truck Tire Sizing

This older system is still widely used, mostly on commercial vehicles.

9.50R16.5LT/D
9.50 = Section Width in inches
R = Radial Construction
15 = Rim Diameter in Inches
LT = Light Truck Designation
D = Load Range

Light Truck Metric

This sizing system mirrors the P-Metric system for passenger tires.

LT235/75R15/C
LT = Light Truck Designation
235 = Section Width in Millimeters
75 = Aspect Ratio
R = Radial Construction
15 = Rim Diameter in Inches
C = Load Range

Alpha-Numeric

In the late sixties, this load-based system evolved. The first letter of the designation identifies the load/size relationship of the tire. The letter can range from "A" to "N", with "A" being the lowest. The lower the letter, the smaller the size and load-carrying capacity at a given air pressure.

BR60-13
B = Load-Carrying Capacity
R = Radial Construction
60 = Aspect Ratio
13 = Rim Diameter in Inches

Millimetric

240/55R390
240 = Section Width in Millimeters
55 = Aspect Ratio
R = Radial Construction
390 = Rim Diameter in Millimeters

European Metric

Essentially this system was a conversion of the Numeric system from inches to millimeters. Aspect ratio appears in the size designation in most cases where it is other than 82.

155SR13, 155R13, 155R13 78S 155 = Section Width in Millimeters
S = Speed Rating (See pages 7&8)
R = Radial Construction
13 = Rim Diameter in Inches
78S = Service Description (Load Index and Speed Rating)