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 FAQ Tire Sizing Passenger Tire Sizing Millimetric
Light Truck MetricThis 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-NumericIn 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 Millimetric240/55R390 240 = Section Width in Millimeters 55 = Aspect Ratio R = Radial Construction 390 = Rim Diameter in Millimeters European MetricEssentially 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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