What is the normal tire pressure for a car in kPa?
2 Answers
Car tire pressure is normal between 2.2 and 2.5. Below is relevant information about car tire pressure: Effects of excessively high tire pressure: The contact area between the tire and the ground will decrease. During driving, the pressure per unit area on the tire will be relatively high. If the car is driven on roads with poor conditions, protrusions on the ground may cause the tire to burst, affecting driving safety. Effects of excessively low tire pressure: The contact area between the tire and the ground will increase. While driving, the tire will generate high temperatures. If driven for a long time, the inner side of the tire may deform, shortening the tire's lifespan and increasing the car's fuel consumption.
Last time I changed tires, I specifically asked the mechanic. For regular family sedans, the tire pressure is generally suitable between 230-250kpa, equivalent to 2.3-2.5bar. It depends on the vehicle weight and tire size. My SUV needs to be inflated to 240kpa for comfort, while my friend's sedan is fine at 230kpa. Remember to measure when the tires are cold for the most accurate reading - right after highway driving, it can be about 20kpa higher than normal. Low tire pressure really increases fuel consumption. Last month when I forgot to check, my fuel consumption rose by half a liter per 100km, and there was a thumping sound over speed bumps. Now I always keep a portable air pump and a tire pressure gauge in the trunk, and I check it basically every month.
