Is it Normal for Trailer Tires to Run at Higher PSI on Interstate

Question:

I have tire monitors on my trailer tires. At cold they are 80psi as thats the max listed on the tire. When driving the trailer down the road and watching the tire monitor, is there a max pressure I should avoid? I’ve seen the tires raise 10psi when driving from start to finish after being on the interstate as they warm up. Is there a maximum pressure or percentage of increase from cold as they warm up?

asked by: Steven

Expert Reply:

Most trailer tires are designed to be ran at their listed maximum psi. So, you should try to keep 80 lbs of air pressure on your trailer tires. Check tires before each trip, when cool. Driven tires need at least 3 hours to cool. Unless you're taking long highway trips in the desert and as long as you have the recommended 80 psi, and you don't exceed the speed rating or the load rating for your tires, the higher PSI on the road should not be a concern.

It's expected and normal for the air to expand in warmer temperatures, like when you're driving your trailer on the highway. While there isn't a standard percentage psi increase or expectation, tire manufacturers are well aware and take this into account. So, max psi listed on the sidewall already takes into account the higher pressure while in motion.

That being said, a bias ply tire like # AM10068 is not going to run as cool as a comparable radial tire like # TT53012C, especially under a load and at higher speeds. A tire that runs cooler lasts longer and promotes the best fuel economy.

I included a link you to our Trailer Tire Frequently Asked Questions for you at the bottom of the page.

expert reply by: Carla M