Tire Labeling
The tires that came on your vehicle have a number of markings. Those you should
be aware of are described below.
Here is an example of what each marking means:
P245/40R19 98W
• P: tire type (passenger vehicle)
• 245: tire width in millimeters
• 40: aspect ratio (tire section height as a
percentage of its width)
• R: tire construction code (radial)
• 19: rim diameter in inches
• 98: load index (code indicating maximum
load tire can carry)
• W: speed symbol (code indicating maximum speed rating)
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n Tire Identification Number (TIN)
The tire identification number (TIN) is a
group of numbers and letters that look like
the following example. The TIN is located on
the sidewall of the tire.
n
Glossary of Tire Terminology
Cold Tire Pressure – The tire air pressure when the vehicle has been parked for
at least three hours or driven less than 1 mile (1.6 km).
Load Rating – The maximum load that a tire is rated to carry for a given inflation
pressure.
Maximum Inflation Pressure – The maximum tire air pressure that the tire can
hold.
Maximum Load Rating – The load rating for a tire at the maximum permissible
inflation pressure for that tire.
Recommended Inflation Pressure – The cold tire inflation pressure
recommended by the manufacturer.
Treadwear Indicators (TWI) – The projections within the principal grooves
designed to give a visual indication of the degrees of wear of the tread.
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