Should Tire Pressure Be Reduced in High Altitude Areas?
2 Answers
Tire pressure in high altitude areas can be appropriately reduced by 0.2 bar. Here is the relevant information: Tire inflation is usually performed under standard atmospheric pressure. However, when entering high altitude areas, the external air pressure is already lower than the standard pressure, causing the internal tire pressure to expand outward. This is why tires often appear slightly bulged and fuller than usual. Here is additional information: When entering high altitude areas, besides tire considerations, note the following: For first-time drivers in high altitude areas, symptoms such as chest tightness, shortness of breath, dizziness, and fatigue may occur due to altitude sickness. Therefore, if the driver experiences discomfort, they should take a short break to allow the body to adapt to the high altitude climate. The lower air density and reduced oxygen levels mean the engine's air intake decreases, leading to a richer fuel mixture, which reduces vehicle power and increases fuel consumption. Additionally, due to the lower air pressure, the fuel mixture is less prone to knocking during combustion. High altitude also means lower temperatures. In extremely cold climates, use cardboard or newspaper to shield the radiator (for vehicles with lower antifreeze freezing points or those using water) to prevent the radiator from freezing due to prolonged low-speed engine operation during fast downhill driving.
I've transported goods on plateaus many times, and tire pressure adjustment is crucial. As altitude increases, the drop in atmospheric pressure can cause tire pressure to be about 10% higher than on plains. Last year when driving on the Sichuan-Tibet line, the tire pressure of my light truck suddenly rose to 3.6 bar upon reaching Zheduo Mountain, with the tires bulging and extremely hard. I quickly reduced it to 3.0 bar before daring to continue. For regular sedans entering high-altitude areas, it's best to set the tire pressure 0.2 bar lower than the standard. For off-road vehicles, consider deflating slightly to increase the contact area. Remember to bring an electronic tire pressure gauge and check every 500 meters of ascent. The intense UV radiation on plateaus, combined with high temperatures and pressure, can accelerate tire rubber aging, so checking tire age before departure is essential.
