The pneumatic tire or air-filled tire consists of a core filled with airtight sealed pressurized air. Typically, a tread made with reinforced steel belting or other materials, seals this inner core and provides the contact area with the road.
The tire would remain inflated with all the vehicle's weight resting on it, as the air pressure inside the tire is greater than atmospheric air pressure. The pressure of the air inside the tire provides resistance against forces which try to deform the tire. When the tire hits bumps in the road, this gives the tire a slight degree of a cushioning effect. If you have experienced taking a ride in an old-fashioned carriage that had wooden wheels, you know how huge of a difference a set of pneumatic tires could make.
Pneumatic tires also come with drawbacks. High-performance situations or highly dangerous applications for example, these tires can suffer a puncture and this will lead to a complete failure. The consequence of a blowout at high speeds could lead to a dangerous car accident. Military planners have to consider tires getting blown out by shooting of guns or explosion shrapnel. A vehicle crew's worst nightmare is becoming trapped in a fire zone due to all of their tires becoming flat. Airless tires obviously don't suffer from these issues and thus, could be more suitable in certain applications.
Pneumatic tires have another problem involving variations in air pressure and tire performance. Lower tire pressure could create increased comfort and improved traction. This is due to the fact that tires flatten a little and more tread is placed in contact with the road. The pressure of the air inside of the tire works to maintain the lateral stiffness of the tire as well as maintain the "up and down" stiffness. Thus, reduced air pressure enables the tires' sidewalls to flex. This leads to poor handling unfortunately. In an airless tire, the stiffness in those two dimensions is independent.
There are other issues with air pressure. Consumers are notoriously unreliable when it comes to maintaining proper air pressure. Tires that have improper air pressure could result in unsafe situations. It is really important to note that pneumatic tires are susceptible to temperature changes also, that could be responsible for changing the internal pressure of the tire. It is really important to consider the kind of environments you will be needing your machine to operate in so that you could regularly check the tires and keep the machinery as safe as possible.