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Old 01-18-2014, 08:34 AM   #1
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Tow Vehicle Tire Pressure

I have replaced my P rated tires with E rated tires. The recommended tire pressure on the truck sticker says 35PSI. This is for the P tires. The max tire pressure on the side of my new E is 80PSI. What would you recommend my unloaded and loaded tire pressure should be for my new E tires? I am thinking 50PSI unloaded and 70 or 80 loaded?
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Old 01-18-2014, 09:09 AM   #2
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How much weight is your trailer putting on your truck?
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Old 01-18-2014, 09:35 AM   #3
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I am not sure on the pin weight yet. I am taking it out today on our first trip. I am thinking about 1,800LBS.. I will be taking it to a scale this weekend.. With this weight I am thinking I should go with 80PSI?
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Old 01-18-2014, 09:47 AM   #4
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With just the 5th wheel pin weight I'm not that heavy, but when I load stuff in the truck bed, I probably get pretty close to that figure.
I run 50-55# MT and 70# loaded. I tried it with more pressure and the ride was pretty rough, so I dropped the pressure.
If you look at the sidewall it will tell you what the load rating is. I was way under that, and my tire dealer said I wouldn't have to max out the pressure.

I would think your rig will be way heavier then mine. It's better to pull on a scale and find out for sure rather than guessing.
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Old 01-18-2014, 10:12 AM   #5
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I am only towing a TT that is 30 ft total and a hitch weight of around 1000#. I left the tires the way they were when I got it(70#) on rear and wore the center of the treads on both rear tires . Obviously too much pressure. Next time its going to be 50-55#. And the ride will be better.
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Old 01-18-2014, 10:15 AM   #6
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harley, are talking MT, loaded, or leaving it at 70# all the time?
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Old 01-18-2014, 10:16 AM   #7
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The tire mfg should have a weight/pressure chart. Try their website or your dealer for the info.
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Old 01-18-2014, 10:28 AM   #8
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Thanks for the help. I just put in 70PSI front and rear. I have stock rims with rubber valve stems. Kind of worried if the rubber stems will take 70PSI. I could not find any Max PSI for the rims. I will see how this rides. I am only going for a short 15 mile local trip to see how everything works. I will weight everything to get a better idea what my pressure should be.
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Old 01-18-2014, 10:36 AM   #9
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Quote:
Originally Posted by Lloyd View Post
harley, are talking MT, loaded, or leaving it at 70# all the time?
My last short trip (before I sold the 3/4 ton) was set at 55 and rode nice and didn't swagger. Did not notice any difference in swayage from the 70#. Left it at 55 empty and was happy. Onstar didn't like it and kept getting messages....
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Old 01-18-2014, 11:00 AM   #10
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I have also heard the more air pressure in your tires the better your fuel mileage will be. Not sure how much difference it makes. I run my tires at max air pressure in the summer months and 50 lbs rear and 60 lbs front in the winter.
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