Forum Discussion

hayesdt's avatar
hayesdt
Explorer
May 10, 2018

Pressures for LT E Tires

My 2015 F-150 came new with Passenger-rated tires, and I have been disappointed with the movement / squishiness / feeling of instability I get when towing our loaded 6500 lb. travel trailer.

So today I’m having load range E tires (up to 80 psi) put on my F-150 and not looking back. My questions are:
1. When towing my loaded 6500# travel trailer, how much air pressure should I use in the tires? and
2. How much pressure should I use when I’m not towing? I fully understand that with the E tires the ride will be rougher than my Passenger rated tires, but I’m not bothered by that.

Thanks.
Tow Vehicles
  • hayesdt's avatar
    hayesdt
    Explorer
    May 10, 2018
    riven1950 wrote:
    18 months ago I did the same. 2013 F150 , going from P to Michelin E rated. TT is about 6200 +/- loaded.
    .
    I contacted Michelin either by phone or chart, can't remember which, and they told me the E tires @ 55psi would equal the max load rating that the P tires had. Of course with stiffer sidewalls. No need to go to 80psi.

    I run mine at 55 loaded for towing, 40 unloaded. Love the way they tow and are very stable. I have them rotated free at 5000mles. Wearing great so far. Ride a little rough but I don't mind that.


    Thanks. Very helpful.
  • Samsonsworld's avatar
    Samsonsworld
    Explorer
    May 10, 2018
    I never could tell any difference over 60psi or so. But I try to run 70-75 loaded.
  • riven1950's avatar
    riven1950
    Explorer
    May 10, 2018
    18 months ago I did the same. 2013 F150 , going from P to Michelin E rated. TT is about 6200 +/- loaded.
    .
    I contacted Michelin either by phone or chart, can't remember which, and they told me the E tires @ 55psi would equal the max load rating that the P tires had. Of course with stiffer sidewalls. No need to go to 80psi.

    I run mine at 55 loaded for towing, 40 unloaded. Love the way they tow and are very stable. I have them rotated free at 5000mles. Wearing great so far. Ride a little rough but I don't mind that.
  • BarryG20's avatar
    BarryG20
    Explorer
    May 10, 2018
    Look up the load inflation tables for the tire and go from there. They pressures are based on weight and the weight listed is per tire usually not per axle so if the rear axle of your truck weighs 3500lbs that is 1750 per tire and that is weight you would use for the pressure rating

    example- in link scroll down to the light truck tire section starting on page L7 and from there find your tire size it will show you the inflation pressures needed for various weights up to the tire size max psi

    http://fifthwheelst.com/documents/Goodyear_Tire_Inflation___Load_Charts.pdf
  • donn0128's avatar
    donn0128
    Explorer II
    May 10, 2018
    While changing tires try to find the rims PSI rating. It will be stamped on the rim somewhere. Many times inside the tire. Never exceed that. Just by being stiffer you will notice a huge difference evwn at 65 PSI.
  • boogie_4wheel's avatar
    boogie_4wheel
    Explorer
    May 10, 2018
    On my last half ton I had 'D' range tires and ran them at 65 (max sidewall). I'd run around 65 in the E as well. I never changed the pressure between loaded and unloaded (and don't do that now).

    One thing to consider is if the factory rims have a maximum pressure rating; stuffing 80psi on the stock rims could be a hazard.

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