How to Read Truck Tire Sizes


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Knowing the size of your truck tires is important for emergency repairs and routine maintenance of your vehicle. This video will explain how to figure out the size of your truck tires and some of the ways to use this information.

There are metric and flotation size measurements. Metric has four sections of measuring including passenger, light truck, special trailer, temporary. If there is no indication of the type of tire, you can assume it’s a passenger.

The section width is the first number. It is the width of the tire in millimeters measured from sidewall to sidewall. The second number after the dash is the aspect ratio. Then an “R” stands for radial. Finally, the wheel size.

The aspect ratio measures the size of the sidewall compared to the width of the tire. If the aspect ratio for a 10.4in wide tire is 50, this means the sidewall is 50% of the width, or 5.4in.

To figure out the height of the tire, you add up the wheel size and two times the sidewall size.

Armed with this information you can choose the best tires for your vehicle. If you have more questions, make sure to take a look in your truck manual for help. Or, click on the link to the video above.

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