Understanding Wide Tire Sets on Trucks: Legalities and Terminologies

When you hear about trucks having tires that are wider than the truck's body, a specific term is often used to describe this setup. This article aims to clarify the terminology associated with such trucks and address the legalities and practical implications of these modifications.

Common Terminology and Usage

When trucks have tires that extend beyond their body, this setup is often referred to as a wide tire set or overlapping tires. In most areas within the U.S., this practice is considered illegal, with enforcement varying by state. Some enthusiasts, however, may simply call it stupid and dismiss the legal implications.

Illegal vs. Practical: What the Law Says

In most U.S. states, having wide tires that extend past the truck’s fenders can be considered illegal. For instance, in Georgia, any tire that protrudes more than one inch outside the fender line is not allowed. This regulation is aimed at ensuring safety and traffic flow, preventing damage to other vehicles and road infrastructure. Despite these legal barriers, some people still opt for this setup for various practical reasons, often involving modification for specific purposes.

Monster Trucks and Specialized Transport

It’s important to differentiate this from monster trucks. These are designed for high-octane off-road competitions and do not adhere to typical truck regulations. On the other hand, the wide tire setup described here is often used in transport trucks, which move large tires from various off-road vehicles like haul trucks and earthmoving machinery such as scrapers.

Technical Specifications and Components

The axle track, also known as track width, is the technical term for the distance between the wheel centerlines on an axle. This spacing plays a crucial role in vehicle stability and performance. When tires stick out past the fenders, it is a combination of tyre width, wheel offset, and backspacing.

Tyre width is the measurement across the carcass of the tire when mounted on the recommended rim width. Wheel offset is the distance between the centerline of the wheel and the mounting flange where the wheel seats onto the axle hub. Backspacing is the distance between the mounting flange and the inner surface of the wheel. A diagram illustrating these components can be found here, where backspacing is a critical factor when switching wheel styles to ensure proper clearance with vehicle components.

Practical Implications and Considerations

Modifying a truck to have wider tires that stick out past the fenders can have both advantages and disadvantages. On one hand, wider tires can improve traction and stability, especially in rough terrain. However, this setup can also lead to increased unsprung weight, reduced fuel efficiency, and potential mechanical issues due to clearance constraints.

When considering these modifications, it’s essential to weigh the pros and cons. Additionally, modifying a truck for wide tires should be done with care to ensure compliance with local regulations and to avoid potential safety hazards.

Conclusion

While wide tire sets on trucks can offer unique advantages, they come with legal and practical considerations. Understanding the terminology and technical specifications is crucial for anyone looking to modify their truck in this way. Whether you're driving in Georgia or another state, it’s important to stay informed about local regulations and consult with professionals to ensure a safe and legal modification.

Related Articles

Understanding Axle Track and Tread Width in Trucks How to Choose the Right Tires for Your Haul Truck Safety Tips for Off-Road Trucking