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Question:

Tire PSI question?

I got all brand new tires. The max PSI writtin on the tire is 51. I put them to between 49 and 50. About a month later maby less, they all dropped down exactly 10 psi. Why? Im from south louisiana and its hot and humid.

Answer:

Why would you inflate the tires to 51 psi? That's dangerous. 51 psi is the maximum rated pressure for the tire, not the recommended pressure for that tire on your vehicle. Use the tire pressure recommended by the vehicle manufacturer and found on the service plate inside the drivers door frame or inside the glovebox door.
This is a easy question that I have run into many, many times. The air that is put in the tire has water in it; How did it get in there? When the tires were installed and inflated, the air compressor at the shop had moisture that was sucked from the air and then pumped in the tire, not much but enough to cause this problem. Sounds stupid I know, but thats what happened. Areas with Ultra high or even moderate humidity have this problem unless the tires are inflated with Nitrogen, then this problem is eliminated. It is hard logic and even harder for a lot of people to understand but some of the major corporate tire dealers are using Nitrogen to solve this issue.
The new nature of the tires, road use, a hot climate, or the high pressure. There are a lot of reasons. I would check your car's tire pressure with the owner's manual. I have a 1989 Nissan truck that holds only 35 psi in its tires. But, different tires, made for different vehicles have different tire pressures. Ford tried to make their SUVs more fuel efficient so they increased the tire pressure slightly. That was how they got the nickname Ford Exploders. For an SUV you might want to keep the tire pressure 10% to 15% below max. One good reason for this is that the slightly deflated tires grab the road better. I don't need to worry about that much for my little truck, but you probably have a much larger one.

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