Understanding Wheel Fitment: A Quick Guide
Choosing the right wheels for your vehicle involves several factors. This guide will help you better understand the key elements that affect wheel fitment, so you can make an informed decision.

What Is Bolt Pattern?
The bolt pattern, or lug pattern, refers to the number of bolt holes in a wheel and the diameter of an imaginary circle drawn through the center of each hole. It’s specific to each vehicle and typically consists of 4, 5, 6, or 8 lug holes for most cars, trucks, and SUVs.

To measure the bolt pattern on a wheel with an even number of holes, simply measure from the center of one bolt hole to the center of the hole directly across from it. For wheels with an odd number of holes, you’ll need a special bolt gauge. You can estimate the measurement by measuring from the center of one bolt to the space between the two bolts across from it, but keep in mind this will only be an approximation.

Wheel Offset
Wheel offset is the distance (in millimeters) between the wheel’s centerline (the midpoint between the inner and outer edges) and its mounting surface, where it connects to the drum or rotor. Offset determines where the wheel sits in the wheel well:

Positive Offset: The wheel is positioned further inside the wheel well.
Negative Offset: The wheel is positioned further outside the wheel well.
Zero Offset: The mounting surface is in line with the wheel’s centerline.

Most modern wheels have a positive offset. The right offset ensures proper wheel placement in the wheel well, so choosing the correct offset is critical to avoid rubbing and ensure smooth operation.

Wheel Backspacing
Backspacing measures the distance from the back edge of the wheel to its mounting surface. To measure backspacing, lay the wheel face down, place a straight edge across the inner lip, and measure the distance from the mounting surface to the straight edge.

While backspacing is related to offset, it isn’t the same thing. Backspacing combines offset with wheel width, which is especially important when considering wider wheels. If you’re upsizing, the offset may need to change to ensure proper clearance and prevent tire or rim rubbing.

Plus Sizing
If you're thinking of upgrading to larger wheels and tires, this process is known as plus sizing. For example, you might move from a 16-inch wheel to a 17-inch, 18-inch, or even 20-inch wheel. Plus sizing requires choosing tires with a shorter sidewall (lower profile) to keep the overall diameter of the wheel and tire combination as close to the stock size as possible.

If you’re interested in plus sizing your wheels and tires, give us a call. Our wheel specialists are ready to help you find the perfect combination for your vehicle.