Trailer tire pressures.

Thanks for the replies, they were all at 45 psi so I aired them up to 50 before I left.

Divate from the manufacturer’s tire pressure rules at your risk since it relieves them of liability.

always adjust inflation with COLD tires, E.G. tires that have cooled to near or at ambient temperature. every tire mfg will state that.

On trailer tires virtually all the tire mfg recomend "inflate to max sidewall pressure when cold" regardless of load. The exception is if the tires have a much much higher load capacity than actual load. E.G. running a LRE tire to replace a LRC. then they will say to adjust downward.

Now if one has gone up in load range on a trailer tire, it is always prudent to also check that the rim is rated for the recomended tire pressure as well. If not one has a decision to make.....

This is different than car/truck inflation that is more based on load.

Tire pressure will rise when running, Mine LRE inflated to 80psi will rise to 90-95 on a hot day on a long tow. Not an issue, tire mfg take that into account in tire design.

Run 50 psi until you get load range D then run at 65 psi.

This is cold inflation... before you roll and before the sun is on them for best results. Although if you have been running fast in the hot sun it is still fine to add air if below 50 psi. And suspect a leak if pressure is low while running. Never reduce pressure unless cold.

I agree with the above posters also. I have always run my trailer tires at the max pressure as stated on the sidewall and have never had a tire failure in over 40 years.
Barney

Agree with all, keep them at max pressure (50psi).

ST tires are designed differently than passenger and truck tires and perform better when aired up to max psi, they tend to build up too much heat if filled significantly lower than max. Nearly two decades of RVing and never have had a blowout, and yes we often tow slightly above 65mph since most of our excursions require interstate travel to get where we are headed.

donn0128 wrote:
Set them to the max COLD pressure as listed on the side walls and leave them alone. Tires are designed to allow for the increase from cold pressure as their temps rise. Always and I mean ALWAYS set and check tires when cold before moving the vehicle.

x2
mine are 50psi recommended cold on side wall
i have a tpms and even on 95 to 100 degree days all 4 normally read up to 60 psi after being on the road.. this is normal

very important to not overload axles also.

You will get different answers about this one. Some will say, set max on sidewall (Me, Don and others)

Others will say follow a load chart, bla, bla, bla……

I have broken every tire rule in the book and have had only one tire failure in 40+ years of towing.

I will always tow at max pressure or even max +10 PSI.

Set them to the max COLD pressure as listed on the side walls and leave them alone. Tires are designed to allow for the increase from cold pressure as their temps rise. Always and I mean ALWAYS set and check tires when cold before moving the vehicle.