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Old 06-23-2015, 10:45 AM   #1
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TV Tires - PSI Conflicts

So the sidewalls on my F-150 TV tires (P-rated) state a max PSI of 44, yet the white sticker in the door states max PSI of 35 cold and states the load limits for front and rear axles. Do I get a higher load limit based on the 44 PSI stated on the sidewalls? If so, how do I find that out? I have been towing at the 44 PSI, and even there, I feel like the tries could use a bit more air (based on visual appearance and bounce), not less.
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Old 06-23-2015, 10:53 AM   #2
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P rated tire have a softer sidewall so you get that nice smooth ride.

Upping the PSI to the tires max rating gets you the max tow capacity of the tires that is on the sidewall nothing more.

Go to a LT tire when you can.
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Old 06-23-2015, 11:05 AM   #3
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I agree in that I believe the white sticker in the door from the manufacturer places those there for a proper ride quality. They like less psi to get a softer ride. It is not intended to tow purposes.
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Old 06-23-2015, 11:14 AM   #4
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The Perelli STR P series slippers I had on my F 150 Screw stated that for towing going to 44 PSI increased load capacity and with more air were less squishy. Put some Michelin LT-AT/2S and towing dramatically improved.
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Old 06-23-2015, 11:36 AM   #5
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The Perelli STR P series slippers I had on my F 150 Screw stated that for towing going to 44 PSI increased load capacity and with more air were less squishy. Put some Michelin LT-AT/2S and towing dramatically improved.
I think I have the same Pirelli's. Where can I find what that increased load capacity is at 44 PSI? I guess it is the limits stated on the sidewalls as F-Idaho mentioned? (Truck has only 3000km on it, so wont be switching tires till I absolutely need to - but then it will be LT's!!).
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Old 06-23-2015, 11:51 AM   #6
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wpg,

These are what I had P275/55R20 44 psi allowed me to tow the Rockwood with the load rating at max inflation.





http://www.tirerack.com/tires/tires....RSTR&tab=Specs

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Old 06-23-2015, 11:55 AM   #7
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The door pressure (cold) is what should be used. (Unless specifically stated differently in the owners manual.) The maximum pressure on the tire is exactly that. "The Maximum pressure". From cold to hot a tire will easily go up 5 or 6 lbs. The manufacture probably doesn't consider "ride" at all. They want maximum MPG for the government and the consumer. If the tire would allow it, they would fill to 100 psi.
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Old 06-23-2015, 12:37 PM   #8
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wpg,

These are what I had P275/55R20 44 psi allowed me to tow the Rockwood with the load rating at max inflation.





http://www.tirerack.com/tires/tires....RSTR&tab=Specs

Brian
Same as mine. Thanks for the help Brian.
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Old 06-23-2015, 01:01 PM   #9
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Never ever go beyond max cold pressure on the side wall. If you think the tires still look soft check your weight you maybe overweight.
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Old 06-23-2015, 01:23 PM   #10
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Same as mine. Thanks for the help Brian.
I would go to the Max on tire. 44 is not enough to give stable ride with any trailer over 4000 lbs. I have E rated 80 psi max tires and the auto manf. suggests 45 rear and 55 front. I ran them there not towing and the tires wore out on the outside edges in about 25000 miles. Had it aligned and talked to alignment technition and he said they were under inflated at those pressures. He ran both ends to 65 and it drove much better, got better mileage, and was little rougher on rough roads and sharp bumps. When towing Fifthwheel with 1500 tongue load I run 80 in rear and 65 in front. Also run 80 in camper tires. It has same rated tires. You won't go wrong using max pressure in camper tires and rear Tow Vehicle tires. Less sway and better mileage and much less likely to blow out. A low tire builds heat real quick. If you ever had a flat while traveling better not touch it unless you have asbestos gloves.
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