Tire experts? The boat has six of these #tires on it. They have a total of 3000 miles on them, mostly with the boat on board. They are labeled for max psi 80lbs and I just checked them all and found that they are all at 65lbs. I was going to bring them up to 70lbs but now I'm wondering if I should. After all, either they all lose pressure at the same rate (which is doubtful) or Discount Tire, where I had them installed while the boat was on the #trailer, set them to 65lbs for a reason. Opinions?

@mlanger

Does the trailer have a tire pressure sticker, or pressures listed in the owner's manual? I'd go with that pressure unless your boat is near or above the limit of the trailer.

Depending on the tire manufacturer, you may be able to call a help line, describe the tires, trailer, and load, and they will tell you what pressures to run. I did that on my truck with BFG.

I never assume that the tires store set the pressures correctly, even when I tell them up front what pressures I want. Although Discount Tire is usually better than most.

@wanderinghermit That's a really good point. I bet it does. Now I just have to track down that manual. I suspect they followed some sort of guidelines when they installed the tires on the way back from Chicago in August 2024. I also had the trailer looked over last year and there's a pretty good chance my trailer guy adjusted the pressure, too. I suspect it's going, but I'll check the manual just in case. I just thought it was weird that all six tires were exactly at 65 pounds.

@mlanger

All of them being at 65 means to me that it was done on purpose. That doesn't mean it was done *right*.

I went through some of this trying to figure out what pressure to use on my wife's horse trailer.