Experienced motorists will say that it is not enough just to change the car into winter tires when the cold weather sets in. Some "experienced" will also point out that it would not hurt to carry out the "pumping" of the wheels, which in fact is no less important "nuance" than the replacement of automobile rubber. We will understand all the intricacies of this issue in order to understand why it is needed at all.
In order to understand why you need to pump the wheels in the winter, it is enough to remember (well, or at least try!) The school physics course. Everyone who even slept during these lessons should remember that when heated, substances tend to expand, and when cooled, they contract. Gases are most susceptible to this. And since the tires of a car are inflated with their mixture - air, this physical rule works for them to the fullest.
The essence of the problem is that after working in a warm workshop, when the tires are changed and the tires are inflated, the pressure is most often adjusted to the values recommended by the manufacturer. However, it is worth leaving the cozy workshop and driving into the cold, as soon the driver notices that the pressure in his wheels has dropped. So, every -8 degrees Celsius, the pressure in the wheels is reduced by 0.1 atmospheres.
As a result, it turns out that with the recommended tire pressure of 2.4 atmospheres for the summer period in winter, the pressure in the wheels at -20 degrees will drop somewhere to 1.9 atmospheres. And this is approximately 20% less than the value recommended by the manufacturer. A car that runs all winter on under-pumped wheels significantly impairs its handling (and hence safety). In addition, fuel consumption increases and the risk of accelerated rubber wear increases. To avoid all this will help a small pumping of the wheels to several atmospheres.
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