What is the maximum allowable tire pressure difference among four tires?

[DeMalia]

The tire pressure difference among four tires should not exceed 0.1 bar. It is normal for the four tires to have slightly different pressures within a 0.1 bar range. However, exceeding this threshold does not necessarily require immediate adjustment, as factors like tire pressure monitoring system errors or varying vehicle loads may cause temporary pressure variations. According to the international GBT2978-2008 standard requirements, recommended tire pressures are as follows: Standard tires: 2.4-2.5 bar; Reinforced tires: 2.8-2.9 bar; Maximum pressure: should not exceed 3.5 bar. Tire pressure reset procedure: First, turn on the ignition switch. Press and hold the tire pressure monitoring reset button until you hear a "beep" sound, then release. The system will store the current normal pressure data, automatically clear previous records, and finally the dashboard warning light will turn off, indicating successful reset completion.

[DeGianna]

I frequently drive long distances and pay special attention to tire pressure issues. The pressure difference between the four tires should ideally not exceed 0.1 bar, which is roughly equivalent to 10 kPa. Last month, when I used a tire pressure gauge to measure, I noticed that with the left front tire at 2.3 bar and the right front at 2.4 bar, the steering wheel started to pull slightly to the right. Now, before every highway trip, I use a portable air pump to adjust the pressure, keeping the difference within 0.05 bar for peace of mind. After all, a significant tire pressure difference not only wears the tires unevenly but also causes uneven stress on the suspension system. What worries me most is losing grip during high-speed cornering in rainy conditions. I always keep tire pressure monitoring caps in my car, which screw onto the valve stems to visually check the pressure difference between the four wheels.

[GavinMarie]

Once when dropping my kid off at school, I noticed the car kept pulling to the right. After a thorough check at the repair shop, they found it was a tire pressure issue. The mechanic said for family cars, a pressure difference exceeding 0.1 bar between the four tires can affect handling, and SUVs like mine are even more sensitive. They used a professional tire pressure gauge and found the right rear tire was 0.15 bar lower than the other three. After inflating it, the car immediately returned to normal. The mechanic advised me to check the tire pressure every two weeks with a simple gauge bought from the supermarket, and adjust if the readings don't match across all four tires. Especially in winter, with large temperature fluctuations, the expansion and contraction from heat can cause more noticeable tire pressure changes.

[VanJuliette]

Last time during maintenance, the technician demonstrated to me that when the tire pressure difference reaches 0.2 bar, the tire wear rate can differ by 30%. Now I've developed a habit: checking tire pressure when refueling. It's very convenient to use the free air pumps at gas stations - first adjust all four tires to the standard value, then measure the deviation after driving for a few days. Ideally, the pressure difference between all four tires should be within 0.08 bar when cold, and any deviation exceeding 0.15 bar must be addressed. Uneven tire pressure not only increases fuel consumption but also makes the vehicle prone to deviation during emergency braking.