Is 40 psi too high for tires?
No, for most cars a tire pressure of 40 psi is too high. You might find 40 psi suitable for some vehicles, especially if they’re carrying heavier loads or if the manufacturer’s recommendation is close to that figure. However, it’s generally too high for most passenger cars, which usually recommend between 30-35 psi. But you shouldn’t go too much over recommended psi. You can safely over-inflate tires by up to 10%. For example, if your tires have a recommended psi of 35, you can go up to around 38 psi without worry. Anything more than that is too much and not recommended.No, for most cars a tire pressure of 40 psi is too high. You might find 40 psi suitable for some vehicles, especially if they’re carrying heavier loads or if the manufacturer’s recommendation is close to that figure. However, it’s generally too high for most passenger cars, which usually recommend between 30-35 psi.