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Old 08-08-2016, 07:53 AM   #1
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Tire load rating upgrade

Hi, I just bought a 25 ft 5th wheel thats been sitting for a couple of years. I want to put new tires on it. The tires it has now are ST 225 75D 15, should I upgrade to a E rated with 10 ply or do I need to stay with the same tire it came stock with? Thanks , oh the trailer weighs 7,600 lbs dry

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Old 08-08-2016, 07:55 AM   #2
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Going higher in tire load rating is a good move. The thing to check for is diameter and thread width. Don't grow that too much to keep clearances.

Dale & Mark Bruss
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Old 08-08-2016, 08:00 AM   #3
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Okay, The only thing I would be changing is the D to E and 8 ply to 10 ply.
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Old 08-08-2016, 08:48 AM   #4
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I've had good luck with E's. Take a look at these: Radial Trail HD

New tire with positive reports to date.
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Old 08-08-2016, 07:32 PM   #5
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The "E" tire can carry a heavier load IF it is inflated to a higher psi. If you don't plan to do that, or if your wheels max inflation is only in the "D" range anyway, you don't gain anything. If your trailer came with D load tires, I suspect the wheels were selected to match and have a 65 psi limit. If so, that's the most you can use in the tires and the E gains you nothing. You would need to upgrade the wheels as well as the tires.

You may find this article helpful:

You should consider the axle weight ratings (GAWR) and try to make sure the combined load capacity of the two tires on each axle exceed the max axle rating. For example, if you have two 3500 lb axles, the tires on each need to be able to carry more than 1750 lbs each. A 225/75R15D is rated for about 2540 lbs each, so that would be fine and you don't need a bigger tire. But if the axles are 5000 lbs each, then the d rated tire is marginal, with only 40 lbs of load capacity above what is needed. You can find the axle GAWRs on the federal weight sticker/plate on the left front of the trailer somewhere.

An alternative may be to go to a slightly wider tire and gain capacity that way. Measure the space in the wheel wells, though, to make sure they won't rub.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 08-08-2016, 08:54 PM   #6
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When someone asks about replacing their trailer tires, I always tell them the same thing.....replace them with light truck tires in the same size. The trailer tires are often expensive, hard riding and just don't hold up, especially on a heavy trailer (not your case).

Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
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