Tire Information (U.S.A.)

Please refer to the sample below.

1. Temporary tires

2. Nominal width of tire in millimeters

3. Ratio of height to width (aspect ratio)

4. Diagonal

5. Rim diameter code

6. Load index & speed symbol

 

T115/70D16 90M is an example of a tire size and load index rating. Here is an explanation of the various components of that tire size and load index rating. Note that the tire size and load index rating may be different from the example.

T

Indicates a tire that may be installed on cars, SUVs, minivans and light trucks as designated by the Tire and Rim Association (T&RA).

115

“115” is the nominal width of the tire in millimeters. This three-digit number gives the width in millimeters of the tire from sidewall edge to sidewall edge. In general, the larger the number, the wider the tire.

70

“70” is the aspect ratio. This two-digit number indicates the tire's ratio of height to width.

D

“D” is the tire construction symbol. D indicates “diagonal ply construction”.

16

“16” is the wheel rim diameter in inches.

90

“90” is the Load Index. This two-or three-digit number indicates how much weight each tire can support.

M

“M” is the speed rating. The speed rating denotes the maximum speed for which the use of the tire is rated.

1. When you check the air pressure, make sure the tires are cold ―meaning they are not hot from driving even a mile.

2. Remove the cap from the valve on one tire.

3. Firmly press a tire gauge onto the valve.

4. Add air to achieve recommended air pressure.

5. If you overfill the tire, release air by pushing on the metal stem in the center of the valve. Then recheck the pressure with your tire gauge.

6. Replace the valve cap.

7. Repeat with each tire, including the spare.

    

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   Some spare tires require higher inflation pressure.

   Close Note

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8. Visually inspect the tires to make sure there are no nails or other objects embedded that could poke a hole in the tire and cause an air leak.

9. Check the sidewalls to make sure there are no gouges, cuts, bulges, cracks or other irregularities.

Inspect all tire pressure monthly (including the spare) when the tires are cold. Maintain recommended pressures for the best ride, top handling, and minimum tire wear. Use the pressures specified on the vehicle tire information placard or tire label for optimum service.