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Old 03-27-2014, 08:04 PM   #1
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Tire Pressure While Towing

Curious. I was towing my travel trailer home from the dealership this morning and noticed that the rear tires increased in air pressure more than the front tires. Does anyone know if this is normal? I noticed this when checking the on board computer in my truck for air pressure in the tires.
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Old 03-27-2014, 08:11 PM   #2
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Trailer or truck tires? If more weight is carried by tires, they will heat more. Same for diff air pressure. Mine will show a few pounds diff by traveling in the sun or shade.
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Old 03-27-2014, 08:11 PM   #3
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Literally was researching the very same issue this evening! I discovered that handling under loaded conditions running P rated tires can be improved by running the tires closer to max sidewall pressure instead of the pressure listed on the door pillar.

It logically follows that tire pressure would increase with a load on the tire, so I would expect an increase in pressure while towing, but I've never checked before...
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Old 03-27-2014, 09:19 PM   #4
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weight and friction = increased temps, which results in increased pressures, it is normal, but if not managed it results in tire failure
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Old 03-28-2014, 04:47 AM   #5
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I always wondered what happens when you put max pressure in P tires and naturally, temperature increases while towing, then there is more pressure in the tire than sidewall max. Isn't that exeding tire capacity?
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Old 03-28-2014, 04:58 AM   #6
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I was wondering the same thing myself.
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Old 03-28-2014, 05:58 AM   #7
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Thats why you check and fill while cold. I think the tire engineers know it will increase while towing in the summer through Arizona..Lol
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Old 03-28-2014, 06:37 AM   #8
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No, what I'm wondering is if when towing it is helpful to inflate the tow vehicles rear tires beyond the door placard's recommendation.
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Old 03-28-2014, 07:12 AM   #9
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No, what I'm wondering is if when towing it is helpful to inflate the tow vehicles rear tires beyond the door placard's recommendation.
When towing on P tires, I always put in the max pressure listed on the sidewall.
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Old 03-28-2014, 07:22 AM   #10
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No, what I'm wondering is if when towing it is helpful to inflate the tow vehicles rear tires beyond the door placard's recommendation.
I run E load so I am always at 80 in the rear. But when I had my half ton, before I had E load tires on it as well, I always ran the max cold pressure on the tire. The door placard is to low for even non towing in my opionion. I ran 35 PSI when not towing and max cold listed on the tire when towing..
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Old 03-28-2014, 07:26 AM   #11
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When towing on P tires, I always put in the max pressure listed on the sidewall.
I don't fill it to the max, but I do increase it. Its makes a world of difference.
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Old 03-28-2014, 08:27 AM   #12
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It's funny, all over the place this seems like common knowledge (filling P-rated tires to the sidewall max while loaded or towing), but I'd NEVER heard of it until last night! People claim that it makes a pretty dramatic difference in towing performance. If it makes any difference at all, I'll be tickled pink! I still have a lot of life on my P-rated tires, so E's are not on the table for a while so I want to get as much out of my P's as I can.

Also, from what I read, tire engineers do take increased pressure due to temperature into account when figuring sidewall max pressures. So I don't feel bad going with the max pressure on the sidewall, though I think I'm going to back off just a little.

To be clear, increasing to max pressure in a P-rated tire does not increase load capacity over that stated at the recommended pressure (usually 35 PSI), it simply adds stability to the tire under higher loads (allegedly).

I'm going to try it next time I have the trailer attached in a couple weeks and see how it goes.
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Old 03-28-2014, 09:44 AM   #13
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I've also been told that the RIM has to be able to handle the additional PSI. I just can't figure out where to find THAT number.
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Old 03-28-2014, 09:53 AM   #14
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Guys it is called COLD INFLATION for a reason. You always check your tires when they are cold eg have been sitting for at least 2 hours. The manufactures know there will be a build up in pressure and have taken that into consideration when they publish the inflation guide.
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Old 03-29-2014, 07:48 AM   #15
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OP were you talking about your trailer tires or your truck tires? If one axle of your trailer is running significantly higher than the other I would look at weight distribution or if your trailer is running level. Nose high will impart greater loads on the rear axle and nose low the opposite.
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Old 03-29-2014, 10:57 AM   #16
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I've also been told that the RIM has to be able to handle the additional PSI. I just can't figure out where to find THAT number.
On a paper tag attached to the rim, or stamped into the rim in a visible area, or stamped into the rim on the inside where you can't see it unless the tire is removed.
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