What is too high for a tire?
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. While 35-45 psi is a general range for light trucks and pickups, the tire pressure level depends on vehicle usage. Psi applies to unloaded driving conditions. Increasing it to 40-45 is a good practice for towing and carrying loads.