Must the tire pressures of all four tires be the same?

[Gatsby]

The tire pressures of all four tires on a car do not necessarily have to be identical. Generally, the front two tires will have slightly higher pressure than the rear ones. For example, the front tires might be at 2.4, while the rear tires are at 2.3. Here is some information about tire pressure: 1. The normal tire pressure for most vehicles is around 2.2-2.5, but this is just a reference value. For the exact recommended pressure, you should check your vehicle's user manual or the area near the door (B-pillar or C-pillar), where the manufacturer provides the recommended cold tire pressure. 2. If you notice a significant inconsistency in tire pressure while driving at high speeds, you should pull over as soon as possible. Wait for the tires to cool down naturally. Avoid releasing air or splashing cold water on hot tires. Once the tires have cooled, inspect each one individually.

[AvaDella]

Just a couple of days ago, I noticed my car was pulling slightly to one side. After taking it to the repair shop, I found out the right rear tire pressure was 0.5bar lower than the left. Actually, the four tires don't need to have completely identical pressure, but a difference exceeding 0.3bar can easily cause issues. The manufacturer's recommended values are usually posted on the door frame or fuel filler cap, and there can be reasonable differences between the front and rear axles. For my front-wheel-drive car, for example, the recommended pressure is 2.4bar for the front tires and 2.2bar for the rear, which works well. If the pressure difference between the four tires is too large, not only does it wear out the tires faster and increase fuel consumption, but it also makes the car prone to losing control when turning in the rain. I've now made it a habit to check and adjust the pressure monthly using an electric air pump, measuring when the tires are cold for the most accuracy. As a side note, remember to increase the pressure by 0.2-0.3bar when the car is fully loaded, especially for the rear tires.

[VonFelicity]

Tire pressure is our top concern for long-distance driving. The four tires don't need identical pressure, but must meet the vehicle manual standards. For instance, my SUV has maintained 2.5bar front and 2.3bar rear tire pressure for five years without issues. However, exceeding 0.3bar pressure difference between two wheels on the same axle causes problems - the car will pull like limping. Last time, my colleague's steering rod deformed due to underinflated left front tire. Modern vehicle's electronic stability systems are also sensitive to tire pressure - significant differences may falsely trigger ABS. Daily checks are simple: use a mechanical gauge to measure each tire when cold in the morning. New cars now come with TPMS that alerts automatically for leaks, while older vehicles can install built-in monitors for just a few hundred yuan.

[MicahLee]

Inconsistent tire pressure can indeed shorten tire lifespan. Last week when I went to change tires, the mechanic pointed at my old tires and said: the left front tire was 0.4bar lower than the right front, causing uneven wear and bald spots. Generally, tire pressure difference on the same axle should be kept within 0.2bar, while slightly larger variations are acceptable between different axles. Refer to the door label for specifics - front tires on family cars are usually 0.1-0.3bar higher than rear tires. Rolling resistance changes with tire pressure: every 0.3bar decrease increases fuel consumption by 3%. Develop good habits: check tire pressure during car washes, account for seasonal variations (0.1-0.2bar lower in summer than winter is normal). Don't rely too much on visual inspection - it's hard to detect pressure differences under 0.5bar with naked eyes.