How to Measure Your Wheels: A Comprehensive Guide

Choosing the perfect set of wheels for your vehicle can be an exciting process. However, it’s essential to understand the different measurements involved to ensure a proper fit. This guide will break down the key components of wheel measurement, helping you confidently select the right wheels for your ride.

Understanding Wheel Measurements

When you see a wheel size listed as, for example, “18×8.5 ET40,” it’s breaking down several key measurements:

• Diameter: The first number, 18, indicates the wheel’s diameter in inches. This is the measurement across the surface of the wheel, from bead seat to bead seat.
• Width: The second number, 8.5, represents the wheel’s width in inches. This measurement is taken from one inner bead seat to the other. It’s important to note that this is not the same as measuring from the outer edge of one side of the wheel to the outer edge of the other.
• Offset (ET): The abbreviation “ET” stands for “Einpresstiefe,” which is German for “offset.” It measures the distance between the wheel’s mounting pad and the center line of the wheel. A positive offset means the mounting pad is closer to the inside of the wheel, while a negative offset places it closer to the outer edge. Offset significantly impacts how a wheel sits on your vehicle.
• PCD (Pitch Circle Diameter): This refers to the bolt pattern of your vehicle. It’s measured in millimeters and indicates the diameter of the circle that passes through the center of each lug hole. For instance, “5×114.3” means there are five lug holes evenly spaced on a circle with a diameter of 114.3 millimeters.

Measuring Your Wheels

Now that you understand the basic measurements, let’s dive into how to measure your current wheels.

Measuring Diameter:

• Place the wheel flat on a surface.
• Use a tape measure to measure the distance from one bead seat (where the tire sits) to the opposite bead seat. This measurement is your wheel’s diameter.

Measuring Width:

• Again, with the wheel flat, measure the distance between the two inner bead seats. This is the wheel’s width.

Measuring Offset:

• Determine the wheel’s center line by measuring the width between the inner bead seats and dividing by two.
• Measure the distance between the mounting pad (where the lug nuts or bolts attach) and the center line.
• If the mounting pad is closer to the back of the wheel, the offset is negative. If it’s closer to the front, the offset is positive.

Measuring PCD:

• Count the number of lug holes on your wheel.
• Measure the diameter of the circle that passes through the center of each lug hole. This is your PCD.

Why These Measurements Matter

Understanding these measurements is crucial for selecting the right wheels for your vehicle. Incorrect measurements can lead to fitment issues, affecting your vehicle’s handling, performance, and safety.

If you’re still unsure about any of these measurements or need further assistance, don’t hesitate to reach out to a wheel and tire specialist or consult the Konig Wheels website for additional resources. Feel free to contact us HERE.

By following this guide, you’re well-equipped to measure your wheels accurately and confidently select the perfect set of wheels for your vehicle.