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