The pressure in the vehicle tire does not depend only uniform wear, but also safety, because the vehicle control depending on whether they are correctly inflated. Due to the low pressure increases the risk of damage to the tire and rim. Besides driving becomes less stable, he begins to “float” on the road, which is especially noticeable at high speeds. This, incidentally, is the main feature, as it is possible to set in motion the wheel deflated. In this case it is necessary to stop and check your tires, as well as mounting bolts. When excess pressure driving is also deteriorating due to the decrease of the tread contact area with the road. The car thus becomes uncomfortable stiffness in movement, and the suspension creates an additional burden. Determined for the optimum tire pressure should be the recommendations of the car manufacturer. Memo in the form of a table of pressure values of the indicators are usually placed near the fuel tank flap or the inside of the driver’s door. It is this information, and should be guided. It is usually advised to do all the experts, it usually comes motorists worldwide. However, motorists in the post-Soviet countries are in conditions that require some adaptation of the universal European recommendations. This is due, above all, with special conditions of operation of the vehicle. For example, urban roads are not the best cover tire pressure should be slightly lower. In winter – 10-12%, in the summer – 5-8%. The documentation on foreign cars – is the pressure provided for an unloaded machine. The fact that the objective quality of the road surface in the post below, the Russian roads less flat, while in winter they often uncleared snow and slippery surface, cover with ice. This, of course, have to make a compromise. Everyone knows that nedokachannye tires wear faster and reduce the number of the car’s handling. However, sometimes it is due to half-mast wheels can achieve the required permeability in contact with the car in the mud or snow, save the car on icy as well as extend the life of all elements of the suspension. Motorists should be sure to take into account that decrease in tire pressure by more than 15% is not only ineffective, but also quite dangerous. But the change in pressure within the operational norms (5-12%) may produce some positive results. Reducing the pressure in the tire increases the contact area of the tread and the road surface. With a significant reduction (more than 15% of normal) are beginning to come into contact with the road side surface of the tire that is not in accordance with its design. A slight reduction of pressure on the unworn tread lead to a redistribution of load on its surface. Worn tread edges will increase, and this, of course, lead to non-uniform change in its thickness during the operation. Increasing the area of the tread and the road surface contact enables reduction of the specific load. That is, the surface pressure is reduced and increased permeability of the vehicle. This is true for all surfaces unpaved. However, certain benefits are beginning to emerge and negative points. Also uneven tire wear, this measure leads to an increase in fuel consumption. Another advantage of the reduction in pressure due to change in the mechanical properties of the wheel surface. Elasticity tires decreases with a decrease in pressure that provides the “absorption” of road surface roughness and reducing the load on the suspension units. Thus the life of ball bearings, rod tip, levers, thrust bearings, and other elements of the suspension is increased. By cons, as stated above, are to reduce handling and stability on the road. Thus, the decrease in tire pressure under operating conditions of the car on bad roads provides increased throughput, improved braking, provides additional comfort and extending the life of suspension components. Themselves tire wear will be faster, fuel consumption will increase, and will have to drive carefully. What can be achieved by increasing the pressure in the tires? A common view is that the increased pressure in the tire reduces fuel consumption. Multiple test trials have proven that in the best case, the savings will be less than 5% of the fuel. And it is doubtful advantage is perhaps the only advantage. But it will add a lot of minuses. In addition to increasing the load on the suspension parts, overinflated tires lead to poor handling, braking distances increase and comfort for the driver and passengers will decrease. All this – the result of reducing the contact area of the tread and the road surface, changes in the elasticity of the tread surface and a violation of load distribution. Because of this, the tire will wear unevenly and its service life while significantly reduced. So, if the reduction in pressure in the tires, there are certain positive aspects, it does not make sense to pump tires.