A pneumatic or air-filled tire consists of an inner core that is filled with pressurized air and sealed airtight. Usually, a tread made with reinforced steel belting or other kind of materials, provides the contact part with the road and seals this inner core.
The tire will remain inflated with all the vehicle's weight resting on it, because the pressure of the air within the tire is more than atmospheric air pressure. The pressure of the air in the tire gives resistance against forces which try to deform the tire. This gives the tire a slight degree of a cushioning effect when the tire hits bumps in the road. If you have experienced taking a ride in an old-fashioned carriage that had wooden wheels, you understand precisely how big of a difference a set of pneumatic tires could make.
Of course, there are several disadvantages to pneumatic tires. For example in high-performance situations or highly dangerous applications, these tires could suffer a puncture and this will result in a complete failure. The consequence of a blowout at high speeds could lead to a serious car crash. Military planners must consider tires getting blown out by firing of guns or explosion shrapnel. A vehicle crew's worst nightmare is becoming trapped within a fire zone due to all of their tires becoming flat. Airless tires obviously don't suffer from these kind of problems and hence, in some applications, could be more suitable.
Pneumatic tires have one more problem involving variations in tire performance and air pressure. Lower tire pressure could create improved traction and increased comfort. This is because of the fact that tires flatten slightly and more tread is placed in contact with the road. The air pressure in the tire works to maintain the lateral stiffness of the tire as well as maintain the "up and down" stiffness. Thus, reduced air pressure allows the sidewalls of the tires to flex. Unfortunately, this leads to poor handling. Within an airless tire, the stiffness in those two dimensions is independent.
There are other problems with air pressure. Consumers are notoriously unreliable when it comes to maintaining correct air pressure. Tires which have wrong air pressure can lead to unsafe situations. It is important to bear in mind that pneumatic tires are also susceptible to temperature changes, which could be responsible for changing the internal pressure of the tire. It is really important to consider the type of settings you would be needing your machine to operate in so that you could inspect the tires on a regular basis and keep the machinery as safe as possible.