In this episode of “Sh*t I Never Knew,” we will be diving into the basics of bolt patterns. Many customers have questions and confusion regarding bolt patterns, so we aim to provide a comprehensive overview to clear up any misunderstandings. Whether you’re purchasing custom wheels or tires, understanding bolt patterns is crucial to ensure a proper fit for your vehicle.
What is a Bolt Pattern?
A bolt pattern refers to the arrangement of the bolts that attach a wheel to a vehicle hub. It is expressed in two numbers, indicating the number of bolt holes and the diameter of the imaginary circle formed by those holes. For example, a bolt pattern of 6x5.5 means there are six bolt holes and the diameter of the circle formed by these holes is 5.5 inches.
Dual Drilled Wheels
One common feature in the wheel industry is the use of dual-drilled wheels. Instead of manufacturing separate wheels for different bolt patterns, manufacturers often create dual-drilled wheels that can fit multiple vehicles. For instance, a wheel may have a bolt pattern of 5x150 and 5x5.5, allowing it to fit Toyota Tacomas and Ram 1500s. This approach simplifies manufacturing, reduces costs, and eliminates the need for different part numbers for each bolt pattern.
Inch vs. Millimeter Measurements
While most bolt patterns are specified in millimeters, some manufacturers use inches. This can lead to confusion, especially when ordering wheels. For example, Chevy’s 6x5.5 bolt pattern is equivalent to 6x139.7 millimeters. Similarly, Ford’s 6-lug bolt pattern may be listed as 6x135, which represents 6x5.3 inches. The use of inches or millimeters depends on the manufacturer’s preference and ease of communication.
Measuring Bolt Patterns
To measure your vehicle’s bolt pattern, you need to determine the distance between the center of one bolt hole to the center of an opposing bolt hole. In the case of a dual 5-lug pattern, measure the distance across two opposite holes to determine one aspect of the bolt pattern. For example, a 5x5.5 bolt pattern means it has 5 lug holes, and the distance across two opposing holes is 5.5 inches. In the case of 5x150, the second bolt pattern measurement would be 150 millimeters.
Covered Center Caps vs. Exposed Lug Nuts
Wheels can come with either covered center caps or exposed lug nuts. Most wheels have covered center caps, providing a sleek and uniform look. However, some new designs feature exposed lug nuts, often associated with spike lug nuts. American Force wheels, for example, custom-make each wheel per order, which allows them to have exposed lug nuts. Having exposed lug nuts is not suitable for dual-drilled wheels, as it would result in extra holes that don’t align with the bolt pattern.
Troubleshooting Fitment Issues
If you encounter fitment issues when installing your wheels, it could be due to the shop’s unfamiliarity with dual-drilled bolt patterns. In such cases, try testing the other set of holes to see if they align. If problems persist, reach out to customer service with detailed information and possibly pictures of the wheels to ensure proper assistance in diagnosing the issue.
Conclusion
Understanding bolt patterns is crucial when purchasing aftermarket wheels or tires for your vehicle. It ensures a proper fit and avoids the inconvenience of receiving incorrect products. By familiarizing yourself with the basics of bolt patterns, you can confidently choose the right wheels that match your vehicle’s specifications. Remember, in case of any doubts or questions, reach out to Custom Offsets for expert assistance.
