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Old 05-17-2018, 06:18 AM   #1
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Max psi

I am wondering if tire pressure could be a problem with my blowouts. The tires call for 80 psi max and that is what I run. However, I have seen them go us as high as 87 on a hot day. Could this be a problem. Should we run lower?
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Old 05-17-2018, 06:30 AM   #2
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Quote:
Originally Posted by namusmc65 View Post
I am wondering if tire pressure could be a problem with my blowouts. The tires call for 80 psi max and that is what I run. However, I have seen them go us as high as 87 on a hot day. Could this be a problem. Should we run lower?


The max PSI indicated is for cold max inflation. They take into account higher pressure from heat during towing conditions. You are more likely to have a blowout due to under inflation than over. Cheap tires are also more prone to blowouts.
One thing to note is that most trailers are close to the load capacity edge on tires. When you lose one on a side it immediately overload the other, and itís prudent to replace them both.
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Old 05-17-2018, 06:31 AM   #3
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Speed could be a factor also. Faster you go, the hotter the tire.
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Old 05-17-2018, 06:44 AM   #4
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Rising cold temps are normal.
How much depends on the ambient temp, the tire load and speed, road conditions, etc.
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Old 05-17-2018, 07:54 AM   #5
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Don't overlook the valve stems. I've been told by tire dealers that OEM trailer rims often have cheap stems that can't handle high temps and pressure. The time it happened to me, the stem looked normal until I bent it. Trouble is the stem deflates the tire in a matter of seconds and the tire gets destroyed, making it look like the tire was to blame. Tire dealers almost always put new stems on with new tires, so no one is the wiser.
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Old 05-17-2018, 08:13 AM   #6
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One other factor may be tire rating. Our North Point had E rated tires, but at almost 14k we were told that we probably needed to move up to and F or G rated tire. Our Pinnacle has G rated tires and we have had no problems.

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Old 05-17-2018, 09:23 AM   #7
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All tires increase in PSI as you drive them. Thats why you only fill them when cold. It's normal.
What tires are you using?
How fast are you towing?
How much weight is on the tires?
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Old 05-17-2018, 11:15 AM   #8
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If your TT is not near the tire's load capacity limit, and you tow in really hot conditions (i.e. Arizona/Texas summer) you may want to consider reducing pressure a bit.

Check your tire manufacturer's website (assuming a good name brand tire like Goodyear or Maxxis) for the tire loading chart for your tire model and size. At 80 psi your trailer can carry the maximum weight listed. At lower pressures, the carrying capacity is slightly reduced, but as long as it is higher than the load you are actually placing on it, that's okay.

I know of a couple of folks who claim to have stopped blowout problems that seem to occur on really hot days in the deep south by dropping the tire pressure slightly and safely (within the limits recommended by the manufacturer).
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Old 05-17-2018, 11:29 AM   #9
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Another thought occurred to me - I've been lucky to have had only 2 blowouts on the road. But in both cases, it was the side of the trailer facing the sun on sunny days. Maybe coincidence, maybe not.
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Old 05-17-2018, 01:35 PM   #10
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I went thru 2 sets of Goodyear Marathon LR-E on my rig.

I upgraded to LR-G fours years and have not had any tire problems since.
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