How to check car tire pressure correctly
(Baonghean.vn) - Car tires need to have the correct standard pressure; if the tire is too soft or too tight, it will cause unsafety. Therefore, it is necessary to have a correct awareness of the standard pressure level, especially in the summer, to ensure safe operation of the vehicle.
Manufacturer recommended tire pressure
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The manufacturer's recommended tire pressure information is usually found in the vehicle owner's manual or on a decal affixed to the vehicle's door/door sill. This number is usually expressed in PSI, KPa or Bar and is usually the maximum allowable pressure.
Each vehicle has a different recommended pressure level, so users should rely on the parameters provided by the manufacturer to inflate the tires.
1 PSI (Pound per square inch) = 6.895 KPa. In which, 1 KPa = 1,000 Pa = 1,000 kg/cm2. In which, 1 KPa = 0.01 Bar; PSI, KPa or Bar are common tire pressure measurement units on user manuals or pressure gauges.
For most sedans, MPVs or small pickups, the standard tire pressure is usually 27 - 32 PSI. Some car models use special tires that can have tire pressure levels up to 40 PSI.
Check the pressure printed on the tire sidewall
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This is especially important when buying a used car. Because the car tires may have been replaced, not the standard tires of the car manufacturer. And there are many car tire manufacturers, so it is necessary to check the pressure specifications printed on the car tire sidewall.
The pressure listed on the sidewall of the tire is the maximum pressure that the tire you are using can withstand. Please note that this is not the optimal pressure for operation.
Pressure is marked on the door sill
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The pressure indicated on the door sill is the pressure recommended by the manufacturer. The actual tire pressure should be compensated for by the weight of the cargo/occupant in the vehicle. Normally, reducing the recommended pressure by 10 - 15% will be a reasonable pressure level.
It should be noted that the tire pressure recommended by the manufacturer is the pressure when the tire is cold - when the vehicle has been stopped for a long time, the tire surface is not hot.
Adjust tire pressure according to season
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Usually, long-time car users often use their eyes to judge the pressure level. But that is difficult to be accurate. Because the trend of car tires is becoming thinner, using the naked eye to judge the car tire pressure is very difficult.
Furthermore, in the summer, when the temperature is high, the air expands more than usual, so at this time it is necessary to inflate the tire a little less than the ideal level to ensure that when the tire heats up, the tire pressure does not exceed the tolerance of the tire wall.
Conversely, in winter, the tire pressure should be inflated just enough so that when the tire heats up, the internal pressure is still at the ideal state.
Time to check car tire pressure
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To ensure safety, you should check your tire pressure every time you fill up your tank or every 30 days. Or when the temperature changes suddenly, you should also check your tire pressure to adjust it to suit the actual situation.
In addition, even in the case of a car that is not moving and the tires are new, the pressure will decrease by about 0.7 PSI/month. Therefore, in the case of not using the car for too long, we should also check and increase/decrease the tire pressure accordingly.