Red Seal Truck and Transport Mechanic Practice Exam

What is the ideal tire pressure range for heavy-duty trucks?

1. 50-70 psi

2. 60-80 psi

3. 70-90 psi

4. 80-100 psi

The correct answer is: 80-100 psi

The ideal tire pressure range for heavy-duty trucks is typically between 80-100 psi. This range is crucial for several reasons. Firstly, maintaining tire pressure within this range helps ensure optimal tire performance, providing better traction, stability, and handling, which are critical in heavy-duty applications. Proper tire pressure also directly impacts load-carrying capacity. Heavy-duty trucks are designed to carry substantial loads, and having the correct tire pressure allows the tires to support these loads without excessive flexing or overheating, which can lead to tire failure. Additionally, maintaining tire pressure within this range contributes to improved fuel efficiency. Under-inflated tires can increase rolling resistance, leading to higher fuel consumption. By ensuring that tire pressure stays within the recommended range, operators can enhance fuel economy and reduce overall operating costs. Lastly, topping off tires to the higher end of the recommended pressure can improve tread wear, prolonging the life of the tires. This is particularly important for heavy-duty trucks that face more rigorous conditions than standard consumer vehicles. Thus, having a tire pressure between 80-100 psi not only supports the truck's operational demands but also promotes safety and efficiency on the road.