Hi, just bought new tires for my 2011 F150 max tow, had the p285/65 r80 and upgraded to the Michelin LTX M/S2 E rated tire same size. I used to run the p tires at 35 unloaded and 45 towing. When I checked the PSI after they installed the tires, they put in the same 35 as was on the door sticker. when I called Ford they said the same as the tire dealer, when I called Michelin, they said the same thing. Am I crazy, but shouldn't these tires be put at a much higher PSI. My trailer has a very heavy tongue weight. My rear axle came in weighing 3700lbs with my WDH on. What PSI should I put the tires at towing and not towing? I have read so many different forum answers, it seems no one has a good answer. When I called Ford I asked what PSI do they run on the F 150's that had the LT tires as standard equipment, and he couldn't answer me. If someone has an F150 that came standard with the LT tires, what does it say on your door sticker? I don't want to ruin these expensive new tires by running them too low.

Depends what the wheels are rated for. Ford is going to tell you to fill the tires per the spec on the sticker, nothing more.

I'm hoping no shop would put E-rated tires on a wheel that isn't rated for the maximum PSI of the tire, but that's certainly worth looking into. Unfortunately, most such numbers are on the wheel rim UNDER the tire and one has to demount to see them. If the wheels are factory, Ford should be able to answer that question, though.For PSI when towing, most go with axle load/weight. Since you have your axle weights, you might look at an inflation chart and go from there.Here's one such chart- it's not from Michelin, though I'm not sure it matters- size/lr's are pretty standard throughout the industry.Note: Numbers given are per tire.Chart from this link

My 2001 F150 6750 GVWR with OEM LT265/70R17-C calls for 36psi(door sticker) in all four tires.I see no reason to go above 50psi. Usually run 40/45 front 45/50 rear when towing.

lcirelli wrote:Hi, just bought new tires for my 2011 F150 max tow, had the p285/65 r80 and upgraded to the Michelin LTX M/S2 E rated tire same size. I used to run the p tires at 35 unloaded and 45 towing. When I checked the PSI after they installed the tires, they put in the same 35 as was on the door sticker. when I called Ford they said the same as the tire dealer, when I called Michelin, they said the same thing. Am I crazy, but shouldn't these tires be put at a much higher PSI. My trailer has a very heavy tongue weight. My rear axle came in weighing 3700lbs with my WDH on. What PSI should I put the tires at towing and not towing? I have read so many different forum answers, it seems no one has a good answer. When I called Ford I asked what PSI do they run on the F 150's that had the LT tires as standard equipment, and he couldn't answer me. If someone has an F150 that came standard with the LT tires, what does it say on your door sticker? I don't want to ruin these expensive new tires by running them too low.This is some information in this post that doesn't seem right:1) The tire size. Tire Guides doesn't have a listing for a 2011 Ford F-150 that says the original tire size was P285/65R18. I also don't see Michelin listing that size in an LT for the LTX M/S2 (or in a P) I do see F-150's with a P275/65R18, and Michelin lists a LR E with that dimensions. Ford also lists that LT size as needing 40 psi. However, my background say that an LT tire needs to have 15 psi more to carry the same load as a P type tire with the same dimensions.So if my info on the tire size is correct, I would go with what Ford says for the LT's - even though their hotline folks didn't seem to know about that. I'm guessing the person at Ford is driven by VIN number and did not know how to look it up any other way.

Yeah, I wrote down the wrong size, it was late at night, 275/65 r18. That is my tire size. Sounds like 40 running empty seems to be good. I will try 45 with the trailer on. That seems a lot more reasonable. Actually then it is exactly what I was running before on the P tires.

New LT tires on f150, what PSI | Good Sam Community

34 Replies

CapriRacer
Explorer II
Jun 29, 2013
lcirelli wrote:
Hi, just bought new tires for my 2011 F150 max tow, had the p285/65 r80 and upgraded to the Michelin LTX M/S2 E rated tire same size. I used to run the p tires at 35 unloaded and 45 towing. When I checked the PSI after they installed the tires, they put in the same 35 as was on the door sticker. when I called Ford they said the same as the tire dealer, when I called Michelin, they said the same thing. Am I crazy, but shouldn't these tires be put at a much higher PSI. My trailer has a very heavy tongue weight. My rear axle came in weighing 3700lbs with my WDH on. What PSI should I put the tires at towing and not towing? I have read so many different forum answers, it seems no one has a good answer. When I called Ford I asked what PSI do they run on the F 150's that had the LT tires as standard equipment, and he couldn't answer me. If someone has an F150 that came standard with the LT tires, what does it say on your door sticker? I don't want to ruin these expensive new tires by running them too low.

This is some information in this post that doesn't seem right:

1) The tire size. Tire Guides doesn't have a listing for a 2011 Ford F-150 that says the original tire size was P285/65R18. I also don't see Michelin listing that size in an LT for the LTX M/S2 (or in a P) I do see F-150's with a P275/65R18, and Michelin lists a LR E with that dimensions.

Ford also lists that LT size as needing 40 psi. However, my background say that an LT tire needs to have 15 psi more to carry the same load as a P type tire with the same dimensions.

So if my info on the tire size is correct, I would go with what Ford says for the LT's - even though their hotline folks didn't seem to know about that. I'm guessing the person at Ford is driven by VIN number and did not know how to look it up any other way.
time2roll
Nomad
Jun 28, 2013
My 2001 F150 6750 GVWR with OEM LT265/70R17-C calls for 36psi(door sticker) in all four tires.
I see no reason to go above 50psi. Usually run 40/45 front 45/50 rear when towing.
Francesca_Knowl
Explorer
Jun 28, 2013
I'm hoping no shop would put E-rated tires on a wheel that isn't rated for the maximum PSI of the tire, but that's certainly worth looking into. Unfortunately, most such numbers are on the wheel rim UNDER the tire and one has to demount to see them. If the wheels are factory, Ford should be able to answer that question, though.

For PSI when towing, most go with axle load/weight. Since you have your axle weights, you might look at an inflation chart and go from there.

Here's one such chart- it's not from Michelin, though I'm not sure it matters- size/lr's are pretty standard throughout the industry.
Note:
Numbers given are per tire.

Chart from this link
therink
Explorer
Jun 28, 2013
Depends what the wheels are rated for. Ford is going to tell you to fill the tires per the spec on the sticker, nothing more.

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New LT tires on f150, what PSI

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