The tires that came on your vehicle have a number of markings. Those you should be aware of are described below.

Following is an example of tire size with an explanation of what each component means.

225/60 R18 100H
225: Tire width in millimeters.

60: Aspect ratio (the tire’s section height as a percentage of its width).

R: Tire construction code (R indicates radial).

18: Rim diameter in inches.

100: Load index (a numerical code associated with the maximum load the tire can carry).

H: Speed symbol (an alphabetical code indicating the maximum speed rating)

■Tire Sizes

Whenever tires are replaced, they should be replaced with tires of the same size.

■Tire Identification Number (TIN)

The tire identification number (TIN) is a group of numbers and letters that look like the example in the side column. TIN is located on the sidewall of the tire.

■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 – Means 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 – Means 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) – Means the projections within the principal grooves designed to give a visual indication of the degrees of wear of the tread.

DOT B97R FW6X 2209
DOT: This indicates that the tire meets all requirements of the U.S. Department of Transportation.

B97R: Manufacturer’s identification mark.

FW6X: Tire type code.