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Tire underinflation and overloading are closely related, such that more often they can be interchanged. In a pneumatic (air-filled) tire, it is not the tire itself that carries the load but the air inside it, so that if a tire is to support a heavy load, more air is required than to carry a lighter load. Tire underinflation is a condition where the air inside is not enough to carry the load imposed, while overloading is defined as a load that is too high for the air inside the car tire to carry.

What causes tire underinflation and Overloading?

There are several causes of tire underinflation and overloading. Leaks are the most common, either from the car tire itself, rim or valve. Loading a car with more than the tire can carry is also another cause. Punctures can also lead to tire underinflation, especially when the puncture provides a small hole from which the air can leak. For steer positions, a tire underinflation is harder to turn than the properly inflated one.

What are the consequences of tire underinflation and overloading?

The most common consequences of tire underinflation are an irregular treadwear, more specifically faster wear at the tread shoulders. Also, because more rubber is in contact with the road, the engine has to expend more energy to turn the tires and move the car, increasing fuel consumption. Aside from this, the tire is more prone to rim bruising and sidewall cut because the sidewall is brought closer to the road by the greater deflection of the tire. A host of other tire conditions are also aggravated or induced by tire underinflation, making it the most important aspect of maintenance that can affect tire life adversely.

How can you avoid tire underinflation and overloading?

Check the air pressure in your car tire regularly, about once every two to three weeks. Physical appearance is not good measure, since some tires appear underinflated only when their pressure is low enough to cause irregular treadwear to the tires.

You can maximize your car tire life and increase efficiency in terms of safety by doing simple tire maintenance and by avoiding tire underinflation and overloading.

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