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Old 12-24-2012, 12:26 PM   #1
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Trailer Tires

I currently have 4 ST235/80/16 chine bombs on the new trailer and want to change to LT tires. I have 6000# axles. I know that most who change go to the size LT 235/86/16 but I have heard that some have clearence issues between tires and used LT 245/75/16 instead. I would like to hear about others expieriences. Have you had clearence issues between tires or the fender skirt. Thanks in advance.
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Old 12-24-2012, 05:05 PM   #2
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Look at Goodyear G614s. They have the same O.D. and width as the ST235/80 tires.
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Old 12-24-2012, 07:17 PM   #3
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In this forum tire replacement was discussed awhile back. I need to check my tires to make sure they are not those crappy chinese trailer damaging tires...ugh

One thing I did learn is that E rated tires match the wheels pressure capability. So you have to make sure your wheels can take the much higher tire pressure that up-graded tires take.

I need to find that thread and print a few if those recommendations before it gets lost in the sea of threads.
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Old 12-24-2012, 07:51 PM   #4
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Yes, the G614 tires are a G rating, but require 110 psig and your current wheel may not take the pressure.

If You are going to upgrade the wheels and need tires as well, I would look at 17.5" wheels and get the H rated 114 Goodyear tire.

Ken
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Old 12-24-2012, 10:00 PM   #5
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There must be a minimum of 1.5" between tandem wheels, because they "grow" as they heat up and as speed increases. Use a tire size calculator to determine the difference in OD between what you now have and what you want to install. The 235R85/16 tires will have a .5" larger radius than the 80 aspect ratio ST tires. This reduces the distance between tires by one inch.
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Old 12-27-2012, 07:14 AM   #6
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Hi

Go to Goodyear’s web site and down load the tire pressure charts.

If your weight is in the range that it should be for your E rated tires then you can run the G-614 at 80 PSI with out any problem.

Some of the newer G-614 are having wear problems even when running 110 PSI.

Firestone makes a tire I believe called the Transforce that have been getting good reviews from the owner that have them.

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Old 12-27-2012, 11:07 AM   #7
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Most of the major tire builders are combining their tire warranty information with a tire owner’s manual. Because of phrases used in the items not covered section it is doubtful you will be able to get warranty coverage from such manufactures as Michelin, Goodyear, Bridgestone, Firestone, BFG, etc. etc.. when asking them to replace Original Equipment ST tires with LT tires. Misapplication is what they will call it.

Here is a Michelin reference to ponder.

http://www.michelinman.com/mediabin/...omise_Plan.pdf

In the items not covered section starting on page 2 you will find the statement below. It’s very significant because the DOT has mandated tire size - including replacements - to become part of the tire safety section of your trailer’s owner’s manual.

Use of MICHELIN® tires that is inconsistent with the safety information provided in your owner’s manual.”


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Old 12-27-2012, 12:22 PM   #8
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Curious...?

If I upgrade to E rated tires that have max pressure of 80, it doesn't mean I would use that pressure when the originals were D rated with max pressure of 65.

I would still inflate to 65psi which is correct for my load, Right?

Then it doesn't matter that the rims can't handle 80 psi because I would never need to inflate that much. The rims would only see 65psi from a E load rated tire.
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Old 12-27-2012, 12:41 PM   #9
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Quote:
Originally Posted by Ray,IN View Post
There must be a minimum of 1.5" between tandem wheels, because they "grow" as they heat up and as speed increases. Use a tire size calculator to determine the difference in OD between what you now have and what you want to install. The 235R85/16 tires will have a .5" larger radius than the 80 aspect ratio ST tires. This reduces the distance between tires by one inch.
OOPS, your off by exactly double. a 1/2 inch in diameter is only a 1/4 inch in any direction if measured from the spindle. So, 1/4 times 2 equals 1/2.
My tires from the factory are less than 1-1/2 spacing and have never had a problem. Tire diameter may grow as they heat up, but I seriously have doubts if it is more than a few thousands of an inch.
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Old 12-27-2012, 01:14 PM   #10
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YOU DO NO INSTALL HIGHER RATED TIRES ON LOWER RATED RIMS.
IT IS SOMEONE ELSE THAT WILL BE KILLED.

In my little town we lost 2 brothers killed by bad rims at assembly.
And that goes for E rated tires on 1/2 tons as I see used all the time pulling RVs.

And I feel that its safer to overload LT tires then installing ST. tires on over inflated application.
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Old 12-27-2012, 05:37 PM   #11
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YOU DO NO INSTALL HIGHER RATED TIRES ON
And I feel that its safer to overload LT tires then installing ST. tires on over inflated application.
Now that makes absolutely no sense! But to each their own foolishness.
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Old 12-27-2012, 05:38 PM   #12
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Originally Posted by raytronx View Post
Curious...?

If I upgrade to E rated tires that have max pressure of 80, it doesn't mean I would use that pressure when the originals were D rated with max pressure of 65.

I would still inflate to 65psi which is correct for my load, Right?

Then it doesn't matter that the rims can't handle 80 psi because I would never need to inflate that much. The rims would only see 65psi from a E load rated tire.
Tires are engineered to run at they're rated pressures. You will be doing more harm and wear by running a higher psi rated tire at lower then required pressures.
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Old 12-27-2012, 07:40 PM   #13
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Quote:
Originally Posted by raytronx View Post
Curious...?

If I upgrade to E rated tires that have max pressure of 80, it doesn't mean I would use that pressure when the originals were D rated with max pressure of 65.

I would still inflate to 65psi which is correct for my load, Right?

Then it doesn't matter that the rims can't handle 80 psi because I would never need to inflate that much. The rims would only see 65psi from a E load rated tire.
The advantage of a E tire comes at the higher 80 psi pressures. IMO pure folly derating a tires performance especially on a trailer which need max sidewall pressures for several reasons unlike the tires on a tow vehicle.

Goodyear tire and rubber and a respectable RV safety group says this abour tire pressure on trailers:

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

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

rvsafety.com

Tire Load and Inflation Ratings

Note: Towable – Travel Trailer/ 5th Wheel owners Due to the severe use conditions experienced by tires when axles are very close together – tire industry experts recommend maximum (sidewall) inflation pressure for towable tires unless this causes a sever over-inflation situation (20psi+), often referred to as the ‘basketball effect’. If this is your situation allow a 10 – 15psi safety margin above the minimum required inflation pressure.

************************************************** *******

The OP has 6k axles on his trailer which any of the 80 psi rated LT tires with 3042 lbs capacity works fine. Many trailers with come OEM or were a upgrade option on 6k axles and smaller.
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Old 12-27-2012, 07:43 PM   #14
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Quote:
Originally Posted by raytronx View Post
Curious...?

If I upgrade to E rated tires that have max pressure of 80, it doesn't mean I would use that pressure when the originals were D rated with max pressure of 65.

I would still inflate to 65psi which is correct for my load, Right?

Then it doesn't matter that the rims can't handle 80 psi because I would never need to inflate that much. The rims would only see 65psi from a E load rated tire.
That depends on tire design. The ST235/80R16D has a load capacity of 3000# at 65 psi. The LT235/85R16E has a load capacity of 3042#at 80 psi.


FastEagle

p.s. I don't know of a ST tire manufacturer that still builds the ST235/80R16 with a LRD anymore.
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