![]() 70 refers to the tires aspect ratio, which. If you have any questions, just give us a call at 1-80, or email us. What do the letters and numbers on my tires mean P refers to the vehicle type. Use the table below to help you find radial tire size equivalents and metric conversions. The first three numbers of a tire size measures the width in millimeters from sidewall to sidewall. Sometimes you will see a size written like 11.2×24 or you may see it like 11.2-24. Tractor tire sizes can be written in many different formats. Standard, Radial, and Metric Tractor Tire Sizes The third number represents the diameter of the wheel this tire will mount on.The “R” represents that the tire uses radial construction.This number now becomes the FIRST number in a traditional size. Then add that number to the wheel diameter. To convert this number to a traditional (inches) tire size, you multiple this number by 2 and divide by 25.4. The second number represents the aspect ratio to the width of the tire (a percentage) HEIGHT when mounted and inflated to proper air pressure but is measured in millimeters. ![]() This will become the second number for a traditional tractor tire size. ![]() The offset is how far inward or outward the mounting surface is in reference to the center-line of the wheel. The offset determines how the wheel and tire set aligns with the wheel well. The width is the distance from each bead seat (from inside to the outside). Divide this number by 25.4 to convert to inches. The wheel size also includes its width and offset.
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