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Old 09-04-2015, 02:03 PM   #15
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Originally Posted by 53flyingcloud View Post
So, what actual "tire pressure" do you normally use ?? Thanks~
There is a placard on both of my trailers that says Airstream recommends xx psi. I consider that the minimum tire inflation pressure, since Airstream based that recommendation on GVWR of the trailer and the tires that came originally on the trailer.

On the sidewall of the tire there is a maximum inflation pressure for that specific tire. I inflate my tires to, or just under, that maximum.

My understanding is the higher the pressure the better (for the tire), without exceeding the maximum limit of either the tire or the wheel.
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Old 09-05-2015, 09:59 AM   #16
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Originally Posted by A W Warn View Post
There is a placard on both of my trailers that says Airstream recommends xx psi. I consider that the minimum tire inflation pressure, since Airstream based that recommendation on GVWR of the trailer and the tires that came originally on the trailer.

On the sidewall of the tire there is a maximum inflation pressure for that specific tire. I inflate my tires to, or just under, that maximum.

My understanding is the higher the pressure the better (for the tire), without exceeding the maximum limit of either the tire or the wheel.
The "Maximum" inflation can be misunderstood. In reality that is the Minimum pressure needed to carry the Maximum stated load. Each type tire i.e. P, LT, ST has it's own wording. I covered this in detail on July 3 2015 on my blog on RVTireSafety

You are correct about the advantages of running higher pressure to lower the Interply shear forces in tires.
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Old 09-05-2015, 10:23 AM   #17
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different rated tire ability to carry load at equal pressure

@Tireman
A hypothetical question:
Assume two tires are of the same size, one D rated the other is E rated. Both are inflated to exactly the same pressure, that is below the maximum inflation for either.

Does one of tires have the ability to carry more or less load when at the equal inflation pressure?

I think I know the answer, but do not recall that I ever heard this question asked or answered before.

Thanks!
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Old 09-06-2015, 07:46 AM   #18
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Originally Posted by A W Warn View Post
@Tireman
A hypothetical question:
Assume two tires are of the same size, one D rated the other is E rated. Both are inflated to exactly the same pressure, that is below the maximum inflation for either.

Does one of tires have the ability to carry more or less load when at the equal inflation pressure?

I think I know the answer, but do not recall that I ever heard this question asked or answered before.

Thanks!
In case Tireman9 doesn't respond right away:

No matter what the load range, a tire's load carrying capacity is directly related to its inflation pressure - that is Load Range D and Load Range E tires operated at the same pressure perform the same.

And just for the folks who are going to struggle with this: There may be an ever so slight improvement using a higher Load Range - BUT - it is so small, it is undetectable in practice.
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Old 09-06-2015, 09:36 AM   #19
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Originally Posted by A W Warn View Post
@Tireman
A hypothetical question:
Assume two tires are of the same size, one D rated the other is E rated. Both are inflated to exactly the same pressure, that is below the maximum inflation for either.

Does one of tires have the ability to carry more or less load when at the equal inflation pressure?

I think I know the answer, but do not recall that I ever heard this question asked or answered before.

Thanks!
Well Capri got to the computer first so I guess he wins.

It might help to understand that answer if you think of a tire for what it really is. Just a container of pressurized gas. It is the pressurized gas that supports the load.
Many time people do not understand what physical differences there may be in tires that appear to be the same except for their Load Range.
There are a number of tests tires must pass and the conditions of the tests are based on the Max load capacity at the appropriate pressure for that load.
These tests include the ability to stay seated on the wheel and another may measure a tire's ability to resist a tread puncture of a special 3/4" dia steel rod.
Sp lets assume we run a tire company and have a LR-D tire already in production and want to add a LR-E. We do the testing and discover our prototype which is based on the LR-D construction passes all the tests except maybe the tread puncture test. So the best thing for us to do in that case would be to increase the strength of the belts.
If however our prototype passed all the tests except the bead test we would need to change the strength of the bead wire. The bead is the band of wire that retains the tire on the wheel.
So depending of test data a tire company will modify prototype constructions to provide the strength required to deliver satisfactory performance. These changes may be minor in some cases and major in others with no way to predict the changes or see them by simply looking at a tire.

Note the above are just two of the dozens of tests a tire must pass but I limited the number to make the answer easier to understand.
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Old 09-06-2015, 11:31 AM   #20
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I carry a 12 volt compressor but have never used it. I use a bicycle pump to add the occaisional couple of pounds - usually requires about 25-30 strokes per tire. I think of it as exercise doing push-ups and has the added benefit of amusing the neighbours.
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