How low should tire pressure be in hot weather?

[StWeston]

In summer, the normal tire pressure ranges between 2.3-2.5 bar, but the specific value should be determined based on the manufacturer's recommendation. Due to the principle of thermal expansion and contraction, summer tire pressure should be maintained at the lower limit of the standard pressure. If the car is parked in direct sunlight during summer, the tire pressure should be reduced by an additional 0.1 bar from the standard pressure to prevent tire blowouts caused by high temperatures. Other factors affecting tire pressure include: 1. Road conditions: On rough roads, the tire pressure can be appropriately reduced by 0.2 bar from the standard pressure. For long-distance highway driving, the tire pressure can be appropriately increased by 0.2 bar from the lower limit of the standard pressure. 2. Measurement environment: The tire pressure of a hot tire differs from that of a cold tire, with a difference of about 0.3 bar. The manufacturer's recommended tire pressure generally refers to the measurement under cold tire conditions. 3. Vehicle load: For half-load conditions, use the lower limit of the standard tire pressure; for full-load conditions, use the upper limit of the standard tire pressure.