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Open Roads Forum  >  Tech Issues

 > E vs. D rated trailer tires

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theoldwizard1

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Posted: 06/14/22 05:15pm Link  |  Quote  |  Print  |  Notify Moderator

Forget ST tires. Use LT tires. Many more brands and sizes to choose from.

Letter and ply rating are "old school" and should not be trusted. Use the actual weight rating on the sidewall. It will also tell you the correct pressure.

phillyg

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Posted: 06/14/22 05:32pm Link  |  Quote  |  Print  |  Notify Moderator

It probably won't ride harder if you adjust your psi downwards, based on your actual weight, and using the tire mfgrs. load table. And, congrats on getting 5 years on Trailer Kings, most fail well before then.


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Cummins12V98

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Posted: 06/14/22 07:28pm Link  |  Quote  |  Print  |  Notify Moderator

2112 wrote:

I had Ds on my FW and kept them aired up to 65psi. I upgraded to Endurance Es and air then up to 68psi.

I tried then at 75psi and it was like the FW was riding on basketballs. Aired them down to 68 and now it rides smooth as glass.

The load chart was about 55psi for my weight


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Cummins12V98

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Posted: 06/14/22 07:29pm Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Forget ST tires. Use LT tires. Many more brands and sizes to choose from.

Letter and ply rating are "old school" and should not be trusted. Use the actual weight rating on the sidewall. It will also tell you the correct pressure.


Correct pressure for what???

theoldwizard1

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Posted: 06/14/22 07:30pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

theoldwizard1 wrote:

Forget ST tires. Use LT tires. Many more brands and sizes to choose from.

Letter and ply rating are "old school" and should not be trusted. Use the actual weight rating on the sidewall. It will also tell you the correct pressure.


Correct pressure for what???

Correct pressure for the rated load.

CapriRacer

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Posted: 06/15/22 04:18am Link  |  Quote  |  Print  |  Notify Moderator

I see no one has mentioned that a Load Range E has the same load carrying capacity as a Load Range D when inflated to the same pressure. At the LR D pressure, a LR E performs the same - ride, sway, etc.

So you can buy a LR E and use it in place of a LR D.

* This post was edited 06/15/22 04:24am by CapriRacer *


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2112

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Posted: 06/15/22 06:57am Link  |  Quote  |  Print  |  Notify Moderator

It was a pease of mind for me. One less thing to worry about.

CapriRacer wrote:

I see no one has mentioned that a Load Range E has the same load carrying capacity as a Load Range D when inflated to the same pressure. At the LR D pressure, a LR E performs the same - ride, sway, etc.

So you can buy a LR E and use it in place of a LR D.
Actually they have about 18% more capacity when inflated to the same pressure when comparing the 75R15(D) and 75R15(E).

Endurance Load Chart

I have 8400lbs across 4 tires. So according to the chart I should air them to 50psi. Even at 55psi they looked too low and would have too much sidewall flex. 68psi just looks and feels right to me. YMMV

* This post was last edited 06/15/22 07:36am by 2112 *   View edit history


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Cummins12V98

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Posted: 06/15/22 07:45am Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Cummins12V98 wrote:

theoldwizard1 wrote:

Forget ST tires. Use LT tires. Many more brands and sizes to choose from.

Letter and ply rating are "old school" and should not be trusted. Use the actual weight rating on the sidewall. It will also tell you the correct pressure.


Correct pressure for what???

Correct pressure for the rated load.


Thought for a minute you were a fill it to MAX psi no matter what kinda guy.

Cummins12V98

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Posted: 06/15/22 07:49am Link  |  Quote  |  Print  |  Notify Moderator

CapriRacer said: "I see no one has mentioned that a Load Range E has the same load carrying capacity as a Load Range D when inflated to the same pressure."


I kinda did say it in code: "but if close to the MAX rating buy the "E" and run them at the same pressure as the "D" tires required."

Cummins12V98

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Posted: 06/15/22 07:51am Link  |  Quote  |  Print  |  Notify Moderator

2112 wrote:

It was a pease of mind for me. One less thing to worry about.

CapriRacer wrote:

I see no one has mentioned that a Load Range E has the same load carrying capacity as a Load Range D when inflated to the same pressure. At the LR D pressure, a LR E performs the same - ride, sway, etc.

So you can buy a LR E and use it in place of a LR D.
Actually they have about 18% more capacity when inflated to the same pressure when comparing the 75R15(D) and 75R15(E).

Endurance Load Chart

I have 8400lbs across 4 tires. So according to the chart I should air them to 50psi. Even at 55psi they looked too low and would have too much sidewall flex. 68psi just looks and feels right to me. YMMV


My Endurance on my Boat Trailer "LOOK" low but the proof is in the pudding they are right on at 50psi as the tread is perfectly even at 20,000 miles.

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