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Old 03-28-2014, 08:26 AM   #11
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Originally Posted by NewBlackDak View Post
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, 09:27 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, 10:44 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, 10:53 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, 08:48 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, 11:57 AM   #16
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Originally Posted by s1njin View Post
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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