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Open Roads Forum  >  Tech Issues

 > E vs. D rated trailer tires

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Grit dog

Black Diamond, WA

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Posted: 06/15/22 09:26am 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.


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.


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CapriRacer

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Posted: 06/15/22 10:51am Link  |  Quote  |  Print  |  Notify Moderator

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.


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2112

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Posted: 06/15/22 11:32am Link  |  Quote  |  Print  |  Notify Moderator

You are correct CapriRacer. I found a generic table and it does compare to Goodyears.


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Grit dog

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Posted: 06/15/22 01:48pm Link  |  Quote  |  Print  |  Notify Moderator

Hemling wrote:

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?


So to succinctly answer your question with the vague info you provided.

If your weight is under the rated capacity of the current tires, it's mostly peace of mind (because in as many bragging rights conversations I've witnessed about any vehicle, RV or motor toy, noone has EVER been like "Dude, I GOT E tires, not those lame lookin D tires).


No they won't cause ANY issues by upgrading. Just set the pressure right and they'll generally be tougher when abused than the lower rated (thinner less strong )tires.

Cummins12V98

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Posted: 06/15/22 03:28pm Link  |  Quote  |  Print  |  Notify Moderator

Dude I gots "D" tires not those lame looking "C" tires. [emoticon]


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time2roll

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Posted: 06/15/22 03:54pm Link  |  Quote  |  Print  |  Notify Moderator

CapriRacer wrote:

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.
Actually the rating for a D tire and an E tire is exactly the same at 65 psi within this group of tires. And both D & E are exactly the same as a C when all are at 50 psi. The chart covers them all. Just don't fill more than the sidewall max.


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Cummins12V98

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Posted: 06/16/22 07:01am Link  |  Quote  |  Print  |  Notify Moderator

This chart???

[image]

Grit dog

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Posted: 06/16/22 09:04am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

Dude I gots "D" tires not those lame looking "C" tires. [emoticon]


Dude, you should put those big stick on white letters on yer Goodyears like all the ricers do!
Now THAT would be boat ramp/campground braggin rights!!

JIMNLIN

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Posted: 06/16/22 09:03pm Link  |  Quote  |  Print  |  Notify Moderator

Tireman9 answer to the same question of going to a E tire from a D tire. In part he says;

** He will gain a safety margin if he increases his inflation to 65psi with LR-D but if he stays at 65psi there is nothing further gained by going to LR-E as there is no difference in the capacity at 65psi.
The same thing would apply to the 22.5 example. When we look at the Goodyear tables we see that at 110psi both the LR-G and the LR-H are rated for 6,175# single or in dual application at 100psi they both are rated as 5,675#.**

And in his rvtiresafety blog on speed rating in part says;
**You will gain nothing from a Load Range change if you do not also increase the air pressure.**

Its been my experience if the D tires have plenty of reserve load capacity above actual scaled wheel load weights then nothing is gained with a E tire at 65 psi.
Having hauled for a living I never heard of using less than sidewall pressures in a tire on a trailer till I started hanging out on rv forums.

Goodyear says in their "weighing a RV website" clicky link
Goodyear Tire and Rubber .... weighing RVs
Special Considerations

**** Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up.***

Now if the D tires load rating doesn't have the proper capacity or proper reserve load capacity then the E tire at 80 psi will be a good upgrade.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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CharlesinGA

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Posted: 06/18/22 06:55pm Link  |  Quote  |  Print  |  Notify Moderator

If you buy an Endurance ST, you will take the load range they offer in that size. GY only makes one load range in a given size, and it is the "upsize".

GY makes a total of 7 different part number Endurance ST tires, two sizes in 14 inch, two sizes in 15 inch and three sizes in 16 inch.

https://www.goodyearrvtires.com/tire-selector.aspx

ST205/75R14 D
ST215/75R14 D

ST205/75R15 D
ST225/75R15 E

ST235/80R16 E
ST235/85R16 E
ST255/85R16 E

If you want LT tires, there are no true LT tires made that I have been able to find, in 15 or 14 inch. 98% of the trailers out there use 13/14/15 inch, so LT is not an option. On some trailers its possible to go to a 16 inch rim and install an LT tire, Airstream does this as an option from the factory on some models.

Charles


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