Tire Size Guide
Understanding Your Tire Size
Know What Those Numbers Mean
Tire sizes might look complicated, but they follow a simple format that tells you everything you need to know about fitment and performance.
Example: 255/45R18
- 255 = Tire width (in millimeters)
- 45 = Aspect ratio (sidewall height as a percentage of width)
- R = Radial construction
- 18 = Rim diameter (in inches)
These numbers help ensure your tires fit correctly and perform as intended.
Where to Find Your Tire Size
Check Before You Shop
Finding your tire size is quick and easy. You can locate it in the following places:
- On the sidewall of your current tires
- Inside the driver-side door jamb
- In your vehicle owner’s manual
- By using our “Find Tires by Vehicle” search tool
Pro Tip: Always double-check your tire size before ordering, especially if your vehicle has aftermarket wheels or previously replaced tires.