We Know Tires
FIRESTONE COMPLETE AUTO CARE HAS PUT TIRES ON MORE CARS THAN ANY OTHER COMPANY.
18 Inch Tires
As a common size for many vehicles, there are plenty of options to choose from when you're shopping for 18-inch tires. Firestone Complete Auto Care carries a wide selection from versatile all-season tires and tough 18-inch all-terrain tires to dependable winter tires, and even ones that can help improve your fuel efficiency. The right tires for you depends on your budget and priorities—and Firestone Complete Auto Care can help you make the right choice. All 18-inch tires are sorted by tire width, height, and diameter. Browse the selection of 18-inch tires we have to offer for your vehicle below.
What's My 18 Inch Tire Width?
If you need to know the width (or cross section) of your 18-inch tires, the first step is locating a series of number similar to: P235/60 R18. This number should be on the vehicle's tire information placard on the inside of the driver's side door or printed on the sidewalls of your current tires. The width of your tires will be the first number in the series, and it is measured in millimeters (mm). In this example, the tire's width would be 235mm.
How to Find the Height of 18 Inch Tires
You can find the height (or aspect ratio) of your tires in the same series of numbers as the width, found either on the inside of your driver's side door or on the sidewalls of your current tires. In the example P235/60 R18, the number directly after the / refers to the height of your tires, which means the height would be 60.
The aspect ratio (height) is given as a percentage of the tire's width. Tire height is measured from the wheel rim to the top of the tread. So, in the example above, the 18-inch tires would have a sidewall height that is 60% of the tire width. 60% of 235mm is 141mm. Converted to inches, this 18-inch tire has a 9.25-inch tread wide and 5.55-inch sidewall height.