Semi-trucks are large commercial vehicles used to transport goods, equipment and materials over long distances. Depending on the type of truck, they can have anywhere from two to eighteen wheels. The number of wheels a semi-truck has is largely determined by its weight and the size of the load it is carrying.
Two Drive Wheels
Semi-trucks with two drive wheels are typically smaller or lighter trucks that are used for local or short-distance travels. These two-wheel trucks are most commonly found in cities and towns where there is a need to move goods around quickly and efficiently. They have a maximum load capacity of about 40,000 pounds, which makes them ideal for transporting smaller loads over shorter distances.
Four Drive Wheels
Four-wheel semi-trucks are slightly larger than two-wheel ones and can carry heavier loads over longer distances. These trucks usually have an engine that is significantly more powerful than that of two-wheel models, allowing them to pull heavier loads with ease. The load capacity for four drive wheel semi-trucks ranges from 40,000 – 60,000 pounds.
Six Drive Wheels
Six drive wheel semi-trucks are some of the largest commercial vehicles on the road today. These trucks can carry up to 80,000 pounds in gross weight, making them ideal for transporting large heavy loads over long distances. As such, they are often seen on highways hauling goods between states or even countries.
Conclusion: Depending on the size and load capacity required by a semi-truck operator there is a range of different truck types available that offer varying numbers of drive wheels. Generally speaking though most semi-trucks have either two, four or six drive wheels depending on the size and weight of their cargo.