The hub is an element of the tractor's running gear to which the wheel is bolted. The hub is placed in the so-called reduction gear and allows the wheel to rotate freely and is responsible for maintaining the wheel in the appropriate position. In tractors of simple construction, the hub is mounted directly on the transmission and drive shaft.

A valve for tubeless tires is an element that allows inflation and pressure regulation in tubeless tires, i.e. tires that do not require the use of an inner tube. This valve is usually equipped with a special sealing mechanism that prevents air from escaping. Thanks to it, it is possible to easily and quickly inflate tires and maintain the appropriate pressure, which affects driving comfort, traction and safety.