Why are tractors with big front wheels and small rear wheels?

Tractors have small front wheels and large rear wheels, without exception.

The front wheel of tractor is mainly used for steering, so it is also called steering wheel. If the front wheel is made wide, the tractor driver must make great efforts to overcome the resistance of the wheel when adjusting the steering wheel to turn the front wheel of the tractor, and the control is not flexible. The soil in the field is soft and uneven. If the front wheel is wide and big, the ground resistance to it will increase. In this way, tractors will consume a lot of power.

The width of the rear wheel is mainly because the rear wheel of the tractor is the driving wheel. In other words, the power is directly transmitted to the rear wheel, which bears much more weight than the front wheel. Therefore, the requirements for rear wheels must be special.