Anywhere from four to ten wheels. Most buses are two axle six wheel designs. The next most common are three axle eight wheel busses. The next step up is three axle ten wheel coaches and large commuters.
Most buses typically have six wheels. They are designed as multi-axle vehicles to distribute the weight of the bus evenly and improve stability. These six wheels are spread across two axles: one at the front of the bus and one at the rear. However, some buses, especially larger ones or those with additional features like articulated buses or double-decker buses, may have more than six wheels to support the increased weight and passenger capacity.