Semi trucks, also known as tractors or lorries, play a major role in transporting goods across the United States. These large vehicles are composed of several components, one of which is their tires. Knowing how many tires a semi truck has is important for their safe operation and maintenance.
Tires on semi trucks are divided into two categories: drive axles and trailer axles. The drive axles – also known as steer axles – are in the front of the truck and have two tires each.
The trailer axles – also known as tag axles or lift axles – are located in the back of the truck and can range from one to six tires per axle depending on the size and weight capacity of the vehicle.
In total, a standard semi truck will have 10 tires: four on steer axles, four on tag axles, and two spares that are typically mounted in the back near the trailer axle. Some larger trucks may have up to 14 tires depending on their capacity. For instance, a triple-axle truck can have up to 12 tires while a quad-axle truck may have up to 16.
Conclusion
A standard semi truck will generally have 10 tires: four on drive axles, four on trailer axles and two spares mounted in the back near the trailer axle. Larger models may have up to 14 or even 16 if they are equipped with extra trailer axles.
