Becamping asked
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Is it OK to run Load Range E 10 ply trailer tires on a 1999 3124KB? You have to fill them to 80PSI, they are rated for trailer use.
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and asked again
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I am still wondering if 80PSI in the load range E is going to cause any problems. Thanks for the recommendation to run at a slightly lower PSI, sounds like the Tire would be OK running at 65 or 70 PSI.
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The answer is the same - only the tire manufacturer can tell you. The people on this forum don't have the right expertise.
Carlisle does make an E-rated ST225/75R15 trailer tire rated at 2830 pounds load at 80 psi. Is this the one you are talking about? The Carlisle web site does say, in several places, that it MUST be inflated to 80 psi. The site also provides the load-vs-inflation table that I mentioned above, but immediately says that it does not endorse reduced pressure. So no one here can "recommend" that you violate the manufacturer's advice.
My personal feeling, as I said above, is that the load range E tire at 80 psi will not make you happy, but I could be wrong, depending on the kind of roads you drive. I think you would do better with a "D" tire. Carlisle makes a D-rated tire, same size, 2540 lbs at 65 psi. Again, Carlisle does not endorse reduced pressure.
Whatever you decide, you might want to join what we have come to call "The Great Tire Experiment". A number of us have switched to different tires by different manufacturers, and we're going to run them for a year, see what happens, and report back to the group. I don't think that there are any Carlisle tires in the experiment yet, so we'd love to have you join us.
Bill