Well, the tires came with the trailer when I bought it and the trailer is new. I assume (and I will double check) that the manufacturer would not install tires that are outside the specs of what is stickered to the side of the trailer. I always check them cold and I have used several gauges to make sure they are correct. The sticker says to fill max to 50 psi. I found (cold) that the tires were at 70 all around. I'm not getting why the tires would be filled past what the manufacturer requires. On my Truck it says 35 all around, I fill it 35 all around and the tire light stays off.