Introduction
In this episode of “I Never Knew,” we will delve into the topic of bolt patterns, specifically focusing on Chevrolet bolt patterns. Many people often have questions and confusion about bolt patterns when it comes to purchasing wheels and tires for their vehicles. We aim to provide a comprehensive understanding of bolt patterns, including how to measure them and why some wheels have covered center caps while others don’t. So, if you’ve ever been puzzled by bolt patterns, this article is for you.
What is a Bolt Pattern?
A bolt pattern refers to the arrangement of the lug holes on a wheel that allows it to be properly attached to a vehicle’s hub. It is represented by two numbers, such as “6x5.5” or “6x135,” where the first number indicates the total number of lug holes and the second number represents the distance, in inches or millimeters, between the center of one lug hole to the center of the lug hole directly opposite it.
Dual Drilled Wheels
One common variation in bolt patterns is the dual drilled wheel. This means that the wheel has two different bolt patterns and can fit multiple vehicle models.
For example, if you have a Chevy 1500 and the bolt pattern listed for a particular wheel is “6x5.5” and “6x135,” it means that the wheel is dual drilled and can fit both Chevy 1500s and other vehicles with the “6x5.5” bolt pattern, such as some Toyota Tacomas. This dual drilled feature allows manufacturers to save time, money, and eliminate mistakes by producing one wheel that fits multiple vehicles.
Understanding Inch and Millimeter Measurements
One source of confusion among customers is the discrepancy between inch and millimeter measurements for bolt patterns. For instance, the Chevy 1500’s bolt pattern is referred to as “6x5.5” in inches and “6x139.7” in millimeters. The reason for this discrepancy lies in the manufacturer’s preference and the desire to make it easier for people to differentiate between different bolt patterns. There is often no specific rhyme or reason as to why a manufacturer chooses to represent bolt patterns in inches or millimeters.
Similarly, Ford’s bolt pattern “6x135” is represented in inches, while its millimeter equivalent is not commonly used. This variation in representation helps distinguish between different bolt patterns without the need for extensive conversions.
Measuring Bolt Patterns
To measure a bolt pattern, you need to determine the distance between the lug holes. In the case of a dual drilled wheel, measure both bolt patterns separately.
For a five-lug wheel with a “5x5.5” bolt pattern, measure the distance from the center of the far right lug hole to the center of the far opposite lug hole. In this case, the measurement is 5.5 inches, indicating a five-lug wheel with a 5.5-inch bolt pattern.
In the case of a “5x150” bolt pattern, measuring the second bolt pattern reveals a distance of 150 millimeters, which is equivalent to approximately 5.9 inches. Therefore, this bolt pattern represents a five-lug wheel with a 150 millimeter (or 5.9 inches) bolt pattern.
By measuring the bolt pattern, you can ensure that the wheels you select are compatible with your vehicle’s hub.
Covered Center Caps vs. Exposed Lug Nuts
Another aspect of wheels that often confuses people is the presence or absence of covered center caps. Most wheels, like the ones shown in the video, come with covered center caps.
The reason why some wheels have exposed lug nuts, like those found on American Force wheels, is due to their manufacturing process. American Force wheels are custom-made and forged, rather than cast from a mold. This customization allows for exposed lug nuts and the option to install spike lug nuts. However, it’s important to note that spike lug nuts may not look as good on wheels with dual drilled bolt patterns, as they would reveal the extra lug holes.
Troubleshooting Fitment Issues
If you encounter fitment issues when mounting your wheels, it’s crucial not to force them onto your vehicle. Wheels should always fit without any excessive effort or pressure. If you’re having trouble fitting the wheels, try testing the other set of lug holes. If the problem persists, reach out to customer service for assistance. They can check the part number and guide you through the process to ensure a proper fit.
Conclusion
Understanding bolt patterns is essential when selecting wheels for your Chevrolet vehicle. By knowing how to measure bolt patterns, deciphering inch and millimeter representations, and recognizing the differences in wheel designs, you can make informed decisions and avoid common mistakes. Remember, if you ever have any questions or concerns about bolt patterns or fitment, don’t hesitate to reach out to customer service for guidance and assistance.
