How to Calculate the Wheelbase for Big Trucks with Multiple Axles

Calculating the wheelbase of a big truck with multiple axles involves measuring the distance between the front and rear axles. This essential measurement plays a critical role in determining the vehicle's handling, stability, and turning radius. This article provides a step-by-step guide to measuring the wheelbase accurately and considerations for different axle configurations.

Steps to Calculate Wheelbase

1. Identify the Axles: Determine the positions of the front and rear axles. For trucks with multiple axles, typically, you will consider the front axle and the last axle in the group.

2. Measure the Distance:

Use a measuring tape to measure the distance between the center of the front axle and the center of the rear axle you are considering. Make sure to measure straight along the line of the chassis, not diagonally.

3. Record the Measurement: The distance you measure in inches or centimeters is the wheelbase of the truck.

Considerations for Multiple Rear Axles

1. Tandem Axle Setup: If your truck has more than one rear axle, for example, a tandem axle setup, you can choose to measure from the front axle to either the center of the first rear axle or the center of the last rear axle, depending on your needs.

2. Manufacturer Specifications: For some applications, it is useful to refer to the manufacturer's specifications for the wheelbase as they often provide standard measurements for specific truck models.

Example Calculation

For example, if the distance from the center of the front axle to the center of the last rear axle is 24 feet, then the wheelbase of the truck is 24 feet.

Conclusion

The wheelbase is a crucial measurement that affects the truck's handling, stability, and turning radius. Always ensure the measurement is accurate to avoid impacting vehicle performance and safety.

Additional Considerations for Various Axle Configurations

For trucks with more than two axles, such as some big trucks, the wheelbase is the distance between the steering front axle and the centerpoint of the driving axle group. In the case of a tri-axle truck, the wheelbase would be the distance between the steering axle and a point midway between the two rear axles.

If there are multiple axles at the rear, the wheelbase is calculated as the distance between the front axle and the center point of the multiple rear axles.

Understanding and correctly measuring the wheelbase is vital for maintaining optimal truck performance, safety, and compliance with legal standards. Whether you are a truck owner, a driver, or a service provider, this guide will help you accurately measure the wheelbase of your big truck with multiple axles.