PSI question

heat is a tire killer
running at 50 psi your tires will actually run cooler than at 35 psi.
the rated load capacity of your tires is at 50 psi
if you run 35 psi then the load capacity is lower .
i upgraded my boat trailer tires from 13 inch to 14 inch .
my boat trailer is a little more bouncy but i do not care because nobody is riding in my boat going down the highway .
i tow my boat long distances in the summer , sometimes in 100 degree heat .
i upgraded because i wanted no problems getting to the lakes, rivers , and the delta .
i run the max inflation pressure listed on the sidewall .
regarding jacknifing i have owned many trailers , all types .
the principal cause of jacknifing is the trailers that have too short a difference between the trailer axles and the trailer ball .
i have owned 8 different boats since 1972 .
the remedy for jacknifing is moving the axle rearward .
my current boat trailer , i moved the axles back a foot .
my trailer will not sway even if i am going too fast down a 7 % grade in a curve with a pepsi in one hand and a sandwich in the other ...........

K Charles wrote:
If the tires have 1760 lb on them you should run 50 PSI, if less weight then you could run less PSI.

Over inflated tires will wear faster, have less traction for braking, and are more liable to cause trailer jackknifing. Obviously the ride suffers, and potential damage due to potholes increases.

If you tell us the ACTUAL weight on each wheel when fully loaded we can then tell you what psi would be recommended by many manufacturers.

For example I have a little single axle TT with ST205/75R15's on it. When fully loaded, as we use it, it weighs 1580#. The tongue weight is 200#, so assuming equal loading there is 690# on each tire. Normal DESIGNER recommended psi of 15 psi will handle a load of 905#.

Does anybody think I should really inflated to 50 psi? If I do so the trailer will jackknife in a heartbeat.

I actally run 20 psi, 15 is a bit too low for my comfort, but I'm sure not running 50 psi. It would be like running solid steel wheels with no tires. Ever ride in an old buckboard?

Life on the tire is easiest if you air it up to its max.

If the tires have 1760 lb on them you should run 50 PSI, if less weight then you could run less PSI.

I"d leave the air pressure up and work on the WD hitch set up to address bouncy towing. Improperly adjusted or improperly sized spring bars will certainly cause a porpoises effect.

Ron3rd wrote:
the B tires where only marginally suited for the trailer.

My thought exactly. When I was shopping/pricing tires I didn't even come across B range tires in that size. I feel better knowing theres a bit more saftey margin built in now.

I had the exact same tires as you on my old trailer and you want to keep them inflated to the max psi on the sidewall which is 50 psi in your case. BTW, my old trailer came with load range B and when 2 of them blew, Discount Tire set me up with load range C. IMO, the B tires where only marginally suited for the trailer.