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Light Truck High Flotation PDF Print E-mail
Passenger & Light Truck Tire Sizing - Light Truck Tire Sizing
Light truck high flotation tires evolved in the mid-seventies as lower aspect ratios became more popular on light trucks and vans. The combination of lower aspect ratios and high flotation yielded better traction on sand and soft soil found in water and off-road situations.

31X10.50R15LT/C
31 = Tire Overall Diameter in Inches
10.50 = Section Width in Inches
R = Radial Construction
15 = Rim Diameter in inches
LT = Light Truck Tire
C = 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)
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