Photo of the plate installed on the car Lada Largus
Pressure depending on modification
Modification Air pressure in tires, front/rear, MPa (kgf/cm2) station wagon (R90) 0,24/0,26 (2,4/2,6) station wagon (R90) Van (F90) 0,24/0,30 (2,4/3,0) Station wagon equipment «CROSS» 0,24/0,26 (2,4/2,6)
Proper tire pressure must be observed especially during overloaded or high-speed driving. When operating a vehicle with a full load and a trailer, the tire pressure must be increased by 0.2 bar. Incorrect tire pressure reduces stability, increases rolling resistance and wears out faster and even creates an accident.
If you have inflated your tires incorrectly, then:
- with a twofold decrease in pressure relative to the normal value, the rolling resistance also doubles
- and more than 10% - fuel consumption;
- if the pressure is greater than normal, the braking distance increases,
- tires wear out
- besides, they make more noise: they buzz if the pressure is reduced, and whistle if it exceeds the correct value;
- and in general driving becomes more dangerous: the tires can collapse!
Pound-force
In Russia, tire pressure is usually measured in bars or atmospheres.
The psi unit came from the USA (pound-force per square inch). 1 bar is approximately equal to 1 kgf/cm2, or 0.9896 atm, or 14.5 psi. A less commonly used unit is the kilopascal:
- 1 kPa = 0.145 psi;
- 1 psi = 6.895 kPa.
How to inflate tires correctly
The required pressure depends on the type and size of the tire, the time of year and the temperature outside, the load on the vehicle, and the type of roads. Not everyone remembers that at negative temperatures, tire pressure drops by 0.1 bar for every -10°C relative to 0°C, and in the heat it grows, sometimes up to 1 atm. High-quality modern tires can withstand such an overload, but they should not be used constantly in this mode.
The normal pressure in a passenger car tire is in the range of 2-3 bar.
Tire pressure should only be measured and adjusted when it is cold, before driving. And regularly! And if you are going on a long trip, then the procedure becomes mandatory.
Detailed information on exactly how many atmospheres, bars or psi should be in your car's tires can be found in the owner's manual, on the back of the gas tank flap, in the doorway or in the spare wheel well.
About nitrogen pumping
Expensive inflation of tires with nitrogen does not at all insure against either growth or loss of pressure. Normal air contains about 78% nitrogen, so increasing its content by 20% cannot drastically change the properties of tires.