Need PSI for my boat trailer tires

[Bill3434]

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.

Never had a problem with my truck aired to sidewalled pressure rating, get better gas mileage too. Car makers recommendation aren't always right ask Ford and Firestone. Ford recommended low pressure causing blowouts in the hot climates with Firestone tires.

 

[BossMaverick1]

Re: Need PSI for my boat trailer tires

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.

I have to disagree with you. The majority of tire blowouts (on quality tires) are caused by under inflation by either a puncture or lack of tire care. The under inflation causes the tire to generate a lot of internal heat by the sidewall's extreme flexing with each rotation of the tire. The tire will eventually come apart when the heat overcomes the tire's compounds.

 

[UncleWillie]

Re: Need PSI for my boat trailer tires

I have to disagree with you. The majority of tire blowouts (on quality tires) are caused by under inflation by either a puncture or lack of tire care. The under inflation causes the tire to generate a lot of internal heat by the sidewall's extreme flexing with each rotation of the tire. The tire will eventually come apart when the heat overcomes the tire's compounds.

That is not what was stated.
The Air Cooled Metal Wheel will not transfer the tire heat in to the Hub.
An under inflated HOT Tire is not the cause of the HUB and BEARING becoming hot.
If the HUB is Hot. The Bearings did it, Not the Tire.

 

[oldjeep]

Re: Need PSI for my boat trailer tires

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

Sounded high? The tires on our pontoon trailer are 110 psi

 

[Frank Acampora]

Re: Need PSI for my boat trailer tires

Uncle willie: you keep dragging out the same example of physics and friction when you know that a pneumatic rubber tire on a road surface does NOT comply with the demonstration model of friction as performed in the classroom.

When you take a video of a loaded and unloaded semi stopping in the same distance and a video if a Lamborghini with semi tires stopping in the same distance, THEN I will believe you!

 

[frantically relaxing]

Re: Need PSI for my boat trailer tires

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.

I actually watched a guy in traffic court use this same logic to prove a loaded semi that hit him SHOULD have been able to stop in time, and because he didn't, it was proof that his tires and/or his brakes were bad, and therefore the truck driver/owner should be ruled at fault.

He had a handful of books, printouts and other data to support his contention.

The judge asked him a question: "Do you have a book in there that explains "inertia"?

After answering 'no', the judge ruled in favor of the truck driver...

Differences in weight and mass make all things NEVER equal...

 

[smokeonthewater]

Re: Need PSI for my boat trailer tires

either way fill the toon tires to the pressure molded into the sidewall and don't use a lambo with semi tires to pull it :facepalm:

 

[UncleWillie]

Re: Need PSI for my boat trailer tires

I actually watched a guy in traffic court use this same logic to prove a loaded semi that hit him SHOULD have been able to stop in time, and because he didn't, it was proof that his tires and/or his brakes were bad, and therefore the truck driver/owner should be ruled at fault.
Differences in weight and mass make all things NEVER equal...

The thing that is NOT Equal is the Tires. Not even Close! :blue:
The Lambo has tires designed for maximum traction. Low mileage.
The Semi has tires designed for maximum mileage. Low Traction.

Weight/Mass and inertia are not in the equation.
Doubling the Weight/Mass produces Twice the Inertia, But Double the Friction Force. They cancel out.
Locked Brake stopping distance remains the same.

In Reality the truck will never out stop the car because Truck Tire and Car tires are designed totally differently.
The Truck's tires weren't BAD, they were just Different.
Slam on your brakes in front of a Semi and you ARE going to be run over!
Assuming the Truck could lock up all 18 wheels in a panic stop,
A Fully Loaded trailer and an Empty trailer will stop in the same distance however.
The car would just be smashed a lot more.

This is one of those "Strange, But True" Items.

 

[Bill3434]

Re: Need PSI for my boat trailer tires

The thing that is NOT Equal is the Tires. Not even Close! :blue:
The Lambo has tires designed for maximum traction. Low mileage.
The Semi has tires designed for maximum mileage. Low Traction.

Weight/Mass and inertia are not in the equation.
Doubling the Weight/Mass produces Twice the Inertia, But Double the Friction Force. They cancel out.
Locked Brake stopping distance remains the same.

In Reality the truck will never out stop the car because Truck Tire and Car tires are designed totally differently.
The Truck's tires weren't BAD, they were just Different.
Slam on your brakes in front of a Semi and you ARE going to be run over!
Assuming the Truck could lock up all 18 wheels in a panic stop,
A Fully Loaded trailer and an Empty trailer will stop in the same distance however.
The car would just be smashed a lot more.

This is one of those "Strange, But True" Items.

Damn you sound like an accident investigator. However trucks have other variables not normally considered on vehicle with 4 wheels. Load shifts and wheel hops, number of axles and tires. But we do start with the standard skid formula which does not consider weight and load shift.

 

[bigdee]

Re: Need PSI for my boat trailer tires

First of all get those silly notions about ride,traction and footprint out of your head. We are talking TRAILER tires. What do trailer tires require? Integrity.....what does your boat ride on? Yes AIR....and that is what gives integrity to the tires. Trailer SPRINGS are for softening the ride not the tires.

 

[QC]

Re: Need PSI for my boat trailer tires

I use Marvel Mystery oil on my turbo bearings prior to start up.

 

[bigdee]

Re: Need PSI for my boat trailer tires

I use Marvel Mystery oil on my turbo bearings prior to start up.

How much and what psi? or is that why they call it mystery oil?

 

[WIMUSKY]

Re: Need PSI for my boat trailer tires

I use Marvel Mystery oil on my turbo bearings prior to start up.

I like synthetic unless I'm using Seafaom, then I use mineral. Semi synthetic with Stabil...........

 

[bigdee]

Re: Need PSI for my boat trailer tires

I like synthetic unless I'm using Seafaom, then I use mineral. Semi synthetic with Stabil...........

DO NOT use stabil with synthetic mystery oil....it will destroy the molecule integrity of the turbo wheel.

 

[GA_Boater]

Re: Need PSI for my boat trailer tires

I use Marvel Mystery oil on my turbo bearings prior to start up.

Dang it, QC. You want an oil thread don't you? :facepalm: Do you pre-heat the MMO or ambient temp?

 

[BobGinCO]

Re: Need PSI for my boat trailer tires

Contrary to Common Logic; All thing being equal;

Logic is increasingly uncommon, and all things are seldom equal.

 

[bjgill17]

Re: Need PSI for my boat trailer tires

we ALWAYS carry the "very heavy" pontoon boat that matches and we bought with the boat trailer and do not plan to tow a 1/2 lighter weight one sooo, I am sorry I, this input may be for something like a flat bed :confused

 

[RogersJetboat454]

Re: Need PSI for my boat trailer tires

we ALWAYS carry the "very heavy" pontoon boat that matches and we bought with the boat trailer and do not plan to tow a 1/2 lighter weight one

So air the tires up to 70, and go boating.
Your due diligence of regularly inspecting the tires should catch any abnormal wear occurring.

 

[MH Hawker]

Re: Need PSI for my boat trailer tires

This bunch tends to wander so far off topic at times they need a GPS to find their way back. With trailer tires you buy then for the weight being hauled ( load rating ) including the trailer and inflate to the recommended PSI and go boating, its that simple.

 

[bjgill17]

Re: Need PSI for my boat trailer tires

LOL, WEEELLLL, I started this thread and IT HAS GOTTEN WAY over my head......Just wanted to know if the 70 psi was correct written on tires....THANK YOU SOO much for the inputs I can UNDERSTAND. I did graduated college so I think I am not totally ignorant, Just don't need info I don't under stand :facepalm: