E vs. D rated trailer tires

[Hemling]

We are moving back to WI after 4 years of living in Miami and I'm making my list of items to address since my unit is 5 years old. One of those is tires. I still have the stock 'Trailer King" D rated tires, and will be changing them out. What exactly is the rationale behind going to an 'E' rated tire on a camper? Obviously more load carrying capacity I understand, but does it ride harder then too? I certainly don't need more jarring transmitted to the chassis. I feel like if you need the load carrying capabilities of a higher rated tire you might also be overloading the chassis. Is it just higher quality of tire? Kind of like going to an 'F' when an 'E' will do the job more comfortably. Is it just peace of mind / bragging rights?

[CapriRacer]

2112 wrote:

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

........

Ah .... Mmmmm ..... Not exactly.

You compared an ST205/75R15 to a ST225/75R15. What is interesting is that the referenced chart doesn't show Load Ranges that Goodyear doesn't make, so you can't actually do an apples to apples comparison for those 2 sizes. (meaning you should be comparing an ST225/75R15 LR E to an ST225/75R15 LR D.) If you look at other charts, you'll see that principle in action.

[Grit_dog]

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.

Speculation on what the OP even has or needs, on your part....and everyone else who has drug this out 2 pages now, beginning to argue about it and the OP hasn't even given any real info to help someone advise him on his question....
Sheesh....try to focus here.

[Cummins12V98]

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.

[Cummins12V98]

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]

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.

[2112]

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

[CapriRacer]

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.

[theoldwizard1]

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.

[Cummins12V98]

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???

[Cummins12V98]

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

Nice seeing a Man using the brain God gave him.

[phillyg]

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.

[theoldwizard1]

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.

[2112]

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

[Cummins12V98]

time2roll wrote:
Get the GY Endurance tires. Probably E rated depending on size. If the ride is bad at 80psi then drop it down to 70-75 psi. But I think it will ride better not worse. Higher margin of load rating will reduce the chance of tire failure. Most factory tires are very close to max rating and is part of the reason people have tire failures.

I agree on the ENDURANCE.

Bottom line know what each axle and preferably what each tire is carrying. If the "D" tire has plant of capacity for your weight then stick with "D" but if close to the MAX rating buy the "E" and run them at the same pressure as the "D" tires required. Better yet use the load inflation chart for the "E" and add 5 psi to what the chart dictates.

My Boat Trailer had "C" tires in 14" and I changed to "D" ENDURANCE and guess what the "C" inflation of 50psi was correct for the new "D" tires. 20k with plenty of tread left and wearing perfectly even.

[Grit_dog]

Tire/wheel size and load rating (D obviously, but weight rating) and camper weight needed to make any accurate recommendation.