What is the normal difference in tire pressure between the four wheels?

[EllieDella]

It is impossible for the tire pressure of all four wheels to always be consistent. Generally, the front two tires will have slightly higher pressure than the rear ones, and a difference within 0.1 bar is normal. The following are the reasons for differences in tire pressure: 1. The front and rear tire pressures are inherently different, which is a normal phenomenon related to the vehicle's center of gravity position and drivetrain configuration. Front-wheel-drive vehicles have higher front tire pressure, while rear-wheel-drive vehicles have higher rear tire pressure. 2. According to research data from the "Tire Industry," tire pressure increases with rising temperature. For every 30°C increase in temperature, tire pressure rises by 16.5%, and when the temperature increases by 40°C, tire pressure increases by 19.5%, resulting in variations in tire pressure.

[BenjaminMarie]

As an experienced driver with many years behind the wheel, I've found that a tire pressure difference exceeding 4 PSI can compromise driving safety. Ideally, the pressure variance among all four tires should be kept within 2-3 PSI - this ensures stable handling without wobbling, while also reducing fuel consumption and tire wear. I make it a habit to perform monthly self-checks using a portable pressure gauge, especially during seasons with significant temperature fluctuations when summer heat rapidly increases pressure while winter cold causes sharp drops. Significant discrepancies require immediate adjustment to prevent blowout risks. When the difference exceeds 5 PSI, you'll noticeably experience unstable steering, particularly dangerous at highway speeds. I've witnessed many accidents originating from this seemingly minor detail, which is why regular checks are crucial.

[McMaximus]

As a DIY car enthusiast who loves tinkering with vehicles, I think keeping the tire pressure difference within 3 PSI is completely normal, and a difference within 10% is generally fine. Just buy a digital tire pressure gauge and you can handle it at home—simple operation and cost-saving. Too big a difference, like over 5 PSI, can cause uneven tire wear and accelerate aging, forcing me to replace them early and spend more money. When measuring hot tires, wait for them to cool down first, or the readings won't be accurate. Check and adjust the pressure more frequently during seasonal changes. DIY maintenance helps prevent small issues and avoids major repairs—peace of mind and budget-friendly.

[PatrickAnn]

There aren't many ways to save money when driving, but incorrect tire pressure really burns fuel. Generally, a difference of 2 to 4 PSI between the four tires is normal. If it exceeds 5 PSI, you can feel the fuel consumption increasing, costing you dozens more each month. From my experience, uneven tire wear also shortens their lifespan, and a significant difference may lead to premature replacement, wasting money. Developing the habit of checking tire pressure weekly at gas stations is simple and effective—small maintenance leads to big savings, especially when fuel prices are high.