How to Measure a Bolt Pattern on a Wheel
Bolt pattern, also known as lug pattern, is an essential specification when it comes to replacing or fitting wheels on a vehicle. It refers to the diameter of the circle that passes through the centers of the wheel’s bolt holes and the number of bolt holes. The correct bolt pattern is crucial for ensuring a secure fit and proper alignment of the wheel with the vehicle’s hub. In this article, we will guide you through the process of measuring a bolt pattern on a wheel.
1. Gather the necessary tools
Before you start measuring the bolt pattern, make sure you have the following tools on hand:
– A tape measure or ruler
– A square or a protractor (optional)
2. Clean the wheel
Ensure that the wheel is clean and free of any dirt or debris. This will help you get an accurate measurement.
3. Locate the bolt holes
Identify the bolt holes on the wheel. Most wheels have four, five, six, or eight bolt holes. If your wheel has a different number, note this down as it will affect the measurement.
4. Measure the bolt circle diameter
Place the tape measure or ruler in the center of the wheel and measure the distance across the circle that passes through the centers of the bolt holes. This measurement is the bolt circle diameter (BCD). Make sure to measure the diameter at the widest point of the wheel to get the most accurate reading.
5. Count the number of bolt holes
Count the number of bolt holes on the wheel. This will determine the bolt pattern. Common bolt patterns include:
– 4×100: Four bolt holes, 100mm apart
– 5×114.3: Five bolt holes, 114.3mm apart
– 6×139.7: Six bolt holes, 139.7mm apart
– 8×165: Eight bolt holes, 165mm apart
6. Verify the bolt pattern
To ensure accuracy, you can use a square or a protractor to measure the angle between two adjacent bolt holes. This angle should be consistent across all bolt holes.
7. Document the measurements
Record the bolt circle diameter and the number of bolt holes for future reference. This information will be helpful when selecting a replacement wheel or when fitting wheels to a different vehicle.
By following these steps, you can easily measure the bolt pattern on a wheel and ensure a proper fit with your vehicle. Remember, the correct bolt pattern is essential for safety and performance, so take your time and measure accurately.