What tire pressure? What load rating?

[Mike Val]

I have a single axle trailer carrying a 2500 lb boat. The tires are 20.5 x8.0-10Do I inflate to the tire pressure listed on the trailer (60 lbs) or the max tire pressure listed on the tires (90 lbs)? What load rating do I need? C? D? E?

Thanks, Mike

 

[bowman316]

Re: What tire pressure? What load rating?

60. unless you are over the load rating on the tires. then do 90.

 

[woosterken]

Re: What tire pressure? What load rating?

my trailer came with 20.5x8.0-10 e (1535lbs load range) i run 90 psi
and i have a tandem trailer

woosterken

 

[Jeff-in-PA]

Re: What tire pressure? What load rating?

I have a single axle trailer carrying a 2500 lb boat. The tires are 20.5 x8.0-10Do I inflate to the tire pressure listed on the trailer (60 lbs) or the max tire pressure listed on the tires (90 lbs)? What load rating do I need? C? D? E?

Thanks, Mike

Mike,
It sounds like you have a heavier rating than the original tire. I have that same size tire/load range ( E ) and I always go a few pounds under maximum pressure ( I use 85-87 psi on my load range E tires which are 90 psi max )

Jeff

 

[Bifflefan]

Re: What tire pressure? What load rating?

The tire is the tire and the trailer is the trailer. Use the PSI marked on the tire, or just under (may 5 psi). The trailer has no idea what tires or on it. Then you still must stay at or under the max weight of the lowest rated piece in the puzzle.

Then if your like me. I run a consistent pressure and then check the tread wear as i use the tire and adjust the PSI as the tread wear indicates. But im kind of anal on things...

 

[jeeperman]

Re: What tire pressure? What load rating?

I have a single axle trailer carrying a 2500 lb boat. The tires are 20.5 x8.0-10Do I inflate to the tire pressure listed on the trailer (60 lbs) or the max tire pressure listed on the tires (90 lbs)? What load rating do I need? C? D? E?

Thanks, Mike

Like posted above by Jeff and Biffle.
The pressure listed on the trailer should also list what size and load rated tire that 60psi was for.
It would be irresponsible for the trailer maker to simply list tire pressure without quantifying what type of tire. Just like what the tire and pressure is listed for your car on that info sticker in the glove box.

Whatever the tire says is what pressure should be run. Anything less diminishes load capacity and also allows tire to flex too much resulting in tire premature failure.

But whatever you do, do not try to make up for an overloaded tire by running more air pressure in it. Overloaded is overloaded get a different tire.

 

[Silvertip]

Re: What tire pressure? What load rating?

If you have a 2400# boat, add the weight of the trailer and you are very near or slightly over 3000# which is getting dangerously close to the maximum load of a load range E tire of that size. Running 60 PSI in those tires means they are underflated for the load. Load range E tires call for 90 PSI for that load. Anything less is inviting a blowout due to underinflation and heat build up.

 

[ezmac]

Re: What tire pressure? What load rating?

Your tires are rated to carry 1000lbs @ 90psi. per tire. You are around 3000lbs total weight so I would be looking for a bigger tire and wheel. It is a physics thing. The bigger the tire the more weight carring capacity you have. To ballpark your weight per tire you would add the boat weight, plus everything in it. Add trailer weight. Subtract your toung weight then divide by 2. (each tire is carrying only half the weight.) Going short distances you will probably be ok but if you put them on the hiway and heat um up you may have a problem. Rubber is a liquid and tires are put together with heat so they will come apart with heat. I would over inflate 5 psi to compensate for loss of air between airings. The 5psi onerinflation is a good rule for all tires.

 

[jeeperman]

Re: What tire pressure? What load rating?

Your tires are rated to carry 1000lbs @ 90psi. per tire. You are around 3000lbs total weight so I would be looking for a bigger tire and wheel.

The OP tire size and pressure indicated on the tire would indicate he has tires capable of 1650lbs load each at 90psi. http://www.kendausa.com/specialtytires/trailer.html
20.5x8x10 road range E

How much does that 5psi over inflation grow to when heat is induced into the tire before it leaks down to where it should be ???

 

[fat fanny]

Re: What tire pressure? What load rating?

overinflating to compensate for wieght or predicted pressue loss is insane tires build up heat no matter what the operating condition is. Fact being they will tend to expand slightly along with it's pressure when heat is introduced. Right @ pressure or a few lbs under is the safe call. And as bifflefan said keeping an eye on tread wear is also a good practice to determine tread wear characteristics. just my 2cents

 

[Silvertip]

Re: What tire pressure? What load rating?

That tire size in a load range E is 1535# and at 90 PSI. That's 3070#.

 

[Philster]

Re: What tire pressure? What load rating?

Doesn't the trailer hitch (tongue weight) reduce the overall tire load? Wouldn't that be a couple of hundred pounds the tires aren't carrying?

 

[jeeperman]

Re: What tire pressure? What load rating?

Well yes, but if you have to use that weight to get the tire loading down under the max. tire rating, your cuttin it way too close.

 

[Gary H NC]

Re: What tire pressure? What load rating?

I have had the best service running the max psi on the tire.
If the tire calls for 90 psi cold it will handle the slight increase of pressure when the tire warms up.That is the way they build the tire to account for that.