How do you read wheel size numbers on an aftermarket truck wheel?
Wheel sizes are written as two numbers, such as 22x10, where the first number is the diameter and the second is the width, both measured in inches. Understanding these numbers along with bolt pattern and offset is the key to finding the right wheels for your truck.
Understanding how to read wheel size numbers is one of the first steps to shopping for aftermarket wheels with confidence. Once you know what the numbers mean, finding the right fit for your truck becomes much easier. Here is everything you need to know.
How are wheel sizes written?
Wheel sizes are typically written as two numbers separated by an x. For example, a wheel listed as 22x10 tells you two key things about the wheel:
- The first number is the diameter of the wheel measured in inches from one side of the wheel face to the other through the center
- The second number is the width of the wheel measured in inches from the inner edge of the barrel to the outer edge
So a 22x10 wheel is 22 inches in diameter and 10 inches wide.
What else is included in a full wheel spec?
Beyond diameter and width, a full wheel specification also includes the bolt pattern and offset. Here is what each part means:
- Bolt pattern: The number of lug holes and the distance between them. For example, a 6x139.7 bolt pattern means the wheel has 6 lugs spaced 139.7 millimeters apart. This must match your vehicle's hub
- Offset: Measured in millimeters, offset describes how far the mounting surface of the wheel sits from the wheel's centerline. A negative offset pushes the wheel outward while a positive offset tucks it inward
- Center bore: The diameter of the center hole in the wheel that fits over your vehicle's hub. This must be equal to or larger than your vehicle's hub diameter
How do I measure my current wheel size?
If you are not sure what size wheels are currently on your truck, here is how to find out:
- Check the back of the wheel spoke or barrel for stamped or printed markings that include the size information. Many wheels have the diameter, width, and offset stamped directly on the wheel
- Check the sidewall of your tire for the tire size, which will give you a good indication of your current wheel diameter. For example, a tire size of LT285/70R17 tells you the wheel diameter is 17 inches
- Measure the wheel yourself using a tape measure. Measure across the face of the wheel from bead seat to bead seat, which is the inner lip where the tire sits, rather than measuring the outer edge of the wheel lip
What is my factory wheel size?
Your factory wheel size can be found in several places:
- Your vehicle owner's manual will list the factory wheel and tire size
- The tire placard on the driver side door jamb lists the recommended tire size, which corresponds to your factory wheel diameter
- Your vehicle dealer or an online vehicle specification database can also confirm your factory wheel size
Why does knowing your current wheel size matter?
Knowing your current wheel size is important for several reasons:
- It gives you a baseline to understand how a new wheel size will look and fit compared to your factory setup
- It helps you understand how a change in diameter or width will affect your speedometer, clearance, and ride quality
- It ensures you order the correct bolt pattern and offset for your vehicle
Not sure what size to order?
Use our guided fitment tool on our homepage to find correctly sized options for your specific year, make, and model. You can also reach out to our sales team and we will help you confirm the right size for your build!