How much does tire pressure generally increase at high speeds?
2 Answers
High-speed tire pressure is generally around 2.3 bar. Below is a detailed introduction to how much tire pressure generally increases at high speeds: 1. Seasonal factors: Winter: Adjust by 0.2 bar based on the standard tire pressure of the car. Summer: Follow the lower limit of the standard tire pressure. If the car is parked outdoors in summer, the pressure is generally 0.1 bar lower than the standard to avoid tire blowouts due to high temperatures. 2. Load conditions: Empty load: Follow the lower limit of the standard tire pressure. Full load: Follow the standard tire pressure when fully loaded. 4. Road conditions: For roads with significant bumps, appropriately reduce the tire pressure by 0.1-0.2 bar based on the standard tire pressure. For roads with minor bumps, this can be ignored. 5. Tire condition: New tires: The tire pressure can be increased by about 0.2 bar based on the standard tire pressure. Old tires: Appropriately reduce the tire pressure based on the standard tire pressure. If the wear is severe, follow the lower limit of the standard tire pressure. Soft tires: Comfort-pattern tires can be increased by about 0.2 bar based on the standard tire pressure. Hard tires: Performance-pattern tires should follow the lower limit of the standard tire pressure.
Last time I drove from Beijing to Shanghai, I noticed the tire pressure changes as soon as I hit the highway. Normally it's around 2.5 kg in city driving, but when speeding over 120 mph on the highway, it quietly rises to about 2.8 kg, typically increasing by 10% to 15%. This is mainly because friction from tire rolling generates heat, causing the internal gas to expand. In summer, after half an hour of highway driving, the temperature rise becomes more noticeable, sometimes increasing by 0.3 to 0.5 bar. I usually check the tire pressure when the car is cold before long trips, keeping it at the recommended value. If it's too high, the tires can wear out faster or lose grip. I recommend not driving too aggressively on the highway, taking breaks at service areas every few hours to feel if the tires are overheating—safety first. Don't underestimate these small changes; I've seen others who didn't pay attention end up with a blowout, which is terrifying!
