Need PSI for my boat trailer tires

[bjgill17]

the total weight of my pontoon and 2 axle boat trailer is 3760 lbs....what would be the cold psi for the 4 tires....what is printed on the tires cannot be correct.

 

[BonairII]

Re: Need PSI for my boat trailer tires

What is printed on the tires?

 

[roscoe]

Re: Need PSI for my boat trailer tires

What is printed on the tires IS correct.

These are trailer tires, they need lots of air to support the sidewalls.

Give us the size, the manufacturer, and the load range of the tires.


8" tires on toon trailers require 90, or even 100 psi to carry the weight.

 

[bjgill17]

Re: Need PSI for my boat trailer tires

what is printed on the tires?

70 psi

 

[bjgill17]

Re: Need PSI for my boat trailer tires

What is printed on the tires IS correct.

These are trailer tires, they need lots of air to support the sidewalls.

Give us the size, the manufacturer, and the load range of the tires.


8" tires on toon trailers require 90, or even 100 psi to carry the weight.

as soon as it stops raining I will go get all the info...thanks

 

[Mel Taylor]

Re: Need PSI for my boat trailer tires

what is printed on the tires cannot be correct.

Why can't it be correct?

 

[GA_Boater]

Re: Need PSI for my boat trailer tires

70 PSI on the side wall is the correct pressure. The rest of the words are probably "Load Rating XXXX lbs. at 70 PSI." . In other words, less pressure reduces the weight rating and also leads to increased tire wear and the increases possibility of blowouts.

 

[smokeonthewater]

Re: Need PSI for my boat trailer tires

don't worry about all info... inflate to 70 psi and you're gtg

 

[bjgill17]

Re: Need PSI for my boat trailer tires

as soon as it stops raining I will go get all the info...thanks

ok, here it is

Manufacturer Carlise.... Sport Trail

Size: 20.5 X 8.0 - 10

Load Range of Tires: (tubeless) Max Load 600 kg (1320 lbs)

 

[bjgill17]

Re: Need PSI for my boat trailer tires

don't worry about all info... inflate to 70 psi and you're gtg

Oh, Ok that is the info I am getting all around....THANK YOU SOO much for input

 

[BonairII]

Re: Need PSI for my boat trailer tires

Worse case....call the tire manufacturer and tell them what your hauling. Ask what pressure they recommend for your scenario.

 

[bjgill17]

Re: Need PSI for my boat trailer tires

Why can't it be correct?

I guess It sounded High but everyone seems to be saying the same thing...go with 70...so much appreciate all the imputs

 

[BonairII]

Re: Need PSI for my boat trailer tires

The softer the sidewall the higher the tire pressure needs to be.

Car tires have strong sidewalls so only 30ish psi is needed.

 

[CaptTorS]

Re: Need PSI for my boat trailer tires

When running trailer tires lower than cold psi ratings, will this contribute to the hubs feeling warm?

 

[GA_Boater]

Re: Need PSI for my boat trailer tires

Yes, because the side walls flex and run warmer heating up everything. Also bearings can warm the hub. Pump the tires up to the right pressure and see if the hubs run cooler.

 

[MH Hawker]

Re: Need PSI for my boat trailer tires

MY load range E tires are at 90 psi

 

[H20Rat]

Re: Need PSI for my boat trailer tires

Yes, because the side walls flex and run warmer heating up everything. Also bearings can warm the hub. Pump the tires up to the right pressure and see if the hubs run cooler.

The amount of heat that a flexing tire can generate will easily be removed by the heat sink action of the metal wheel spinning around. If the hub is well above ambient temp, its the bearing.

 

[H20Rat]

Re: Need PSI for my boat trailer tires

70 PSI on the side wall is the correct pressure. The rest of the words are probably "Load Rating XXXX lbs. at 70 PSI." . In other words, less pressure reduces the weight rating and also leads to increased tire wear and the increases possibility of blowouts.

This discussion can be almost as bad as transom savers, but... Running the max PSI can also contribute to increased tire wear if you have a light load. Lets say your tires are rated at 1000 lbs at 70 PSI. If you only have 500 pounds of load on them but put in 70 pounds of air, the tire is going to be running on the center of the tread only. This not only increases wear, but also vastly reduces traction. The goal is to have a consistent footprint on the ground. (in other words, the easiest way to think of it is take a pic of the tire with 1000 pounds on it. You want it to look EXACTLY like that with 500 pounds.)

(note, in no way am I saying it is a linear relationship. Half the load doesn't equal half the air. It might only be 80% of the air)

Another real world example... Go put in the max rated psi into your car tires and go drive around. In particular take a sharp turn in wet conditions. (make sure you pick a spot with a gradual ditch, because you probably will be visiting it)

 

[GA_Boater]

Re: Need PSI for my boat trailer tires

A boat trailer is going to carry the same weight, give or take a few hundred pounds for used fuel, fish payload, drinks consumed, etc. So why try to adjust tire pressure to compensate. It's virtually impossible.

EDIT - A car's air pressure is set by the maker based on weight and operation. Airing up to the max pressure on the side of the tire is asking for problems. And you don't need a wet road. Just try a panic stop.

 

[UncleWillie]

Re: Need PSI for my boat trailer tires

... This not only increases wear, but also vastly reduces traction. ...

Here we go again!

The amount of Traction (Friction) between the Tires and the Road is directly proportional to the Coefficient of Friction of the two Materials, and the Force (Weight).

The surface area is irrelevant.
Dragging a sheet of plywood down the driveway on its edge will take the same force as dragging it on a flat face.

Contrary to Common Logic; All thing being equal;
A Fully Loaded Truck and an Empty Truck will stop in the same distance with fully locked brakes.
If they both had the same tires, A Lamborghini and a Semi Truck would stop in the same distance with fully locked brakes.
Your trailer will slide out in a sharp turn at the same speed whether the boat is on it or it is empty.