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I think I bought too much tire for my truck – “E” minimum pressure?

Discussion in 'Wheels & Tires' started by JJK, Oct 9, 2010.

  1. Oct 9, 2010 at 9:34 AM
    #1
    JJK

    JJK [OP] Active Member

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    2008 DC LB 4x4 - 4155lb curb weight empty.
    Hi guys – I just replaced a set of regular Goodyear Silent Armor tires (50k on them,) with the “Pro-Grade” load rang E version because that is what the dealer had in the warehouse and they have a little more tread.
    I ran my old set at 36PSI and they road nice and lasted 50K (could have gone another 10K or 15K but the snow is coming soon). This new set rides a bit harsher. Is there a “minimum” pressure I should stay above on a load range E tire? – They ride better at 33PSI but I worry that it might be too low to support the sidewalls?. Door jamb sticker says 29PSI for the stock tires. – Thoughts?
    I didn’t find any “minimums” mentioned for this load range when I searched.
    Thanks
    JJK
     
  2. Oct 9, 2010 at 9:37 AM
    #2
    98_Mud_bug

    98_Mud_bug 98_mud_bug

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    i have 10 ply tires on mine. they are load range E. i run about 40 psi in mine.. they are a stiff tire because they are made for a full size truck and made to carry a load.
     
  3. Oct 9, 2010 at 9:39 AM
    #3
    zebra1550

    zebra1550 Well-Known Member

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    I run my "E" rated REVO 2's at 40 PSI all the way around. I've got over 15K miles on them so far and I can just now notice a little wear from when they were new. I still have nice deep tread, and they are wearing perfectly even. I've rotated them every 5K so far. I'm really happy with the ride, as they are smoother than my wife's mercedes.
     
  4. Oct 9, 2010 at 9:40 AM
    #4
    derekabraham

    derekabraham Living vicariously through everybody

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    TW'S Hippy Liberal
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    I have load range E BFG KM2s and I run them at 36psi and get 19mpg. :cool:


    I've got about 7,000 miles on them and they haven't worn much. They look brand new.
     
  5. Oct 9, 2010 at 10:13 AM
    #5
    gobias

    gobias as in Gobias some coffee

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    I have BFG AT KO Load E on mine and run them at 40 psi.
     
  6. Oct 9, 2010 at 3:53 PM
    #6
    JJK

    JJK [OP] Active Member

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    Well – Digging around I found some good info from Goodyear on capacity vs. inflation pressure for LT rated tires.
    The LT245/75/16 is rated at 3042lbs per corner at 80PSI, and 1700lbs per at 35PSI - so It looks like I should be able to run them at 33psi (for the ride factor) on the light weight Tacoma. I don’t think the front or rear axle weight is anywhere near 3400lbs (1700x2). I just need to remember that LT tires need to be pumped up for very heavy loads. I could exceed the load capacity of the truck before I exceed the load rating of the E range tire at 35psi. I only carry duck decoys and dogs most of the time with the occasional load of wood and the odd appliance now and then.:)
    http://www.goodyear.com/rv/pdf/rv_inflation.pdf
    I found the exact same chart for Bridgestone too.
    Thanks
    JJK
     
  7. Oct 9, 2010 at 3:57 PM
    #7
    moto932

    moto932 What's the matter, Colonel Sandurz? CHICKEN?

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    X2 except i have cooper zeon ltz's
     
  8. Oct 9, 2010 at 4:33 PM
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    DevL

    DevL Well-Known Member

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    You can run whatever you want. High load rated tires can hold higher presure for heavier loads but dont require higher pressure. You can run 29 if you wanted.
     
  9. Oct 10, 2010 at 6:25 AM
    #9
    Archangel

    Archangel Discount Tire Company

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    I run 35 psi on my KM2's Load Range E and get almost 20mpg
     
  10. Oct 10, 2010 at 12:09 PM
    #10
    Krazie Sj

    Krazie Sj Resident Jackass

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    ^Same PSI on my BFG A/T E load and I also get about 20-21 mpg.
     
  11. Oct 10, 2010 at 7:44 PM
    #11
    bivey

    bivey Well-Known Member

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  12. Oct 10, 2010 at 7:54 PM
    #12
    OffroadToy

    OffroadToy This ain't Dodge City, and you ain't Bill Hickok

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    Have you guys running the load range "E" tires noticed a big difference from stock tires going down washboard dirt/gravel roads? Is the ride noticably rougher or about the same??
     
  13. Oct 11, 2010 at 1:22 PM
    #13
    JJK

    JJK [OP] Active Member

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    I had been reading on other truck forums that it is NOT OK to run LT load range E tires at low (passenger tire type) PSI because of the risk of heat related issues etc, and that they should not be run below 50PSI – so because I have OCD I ran the numbers based on all the data I could gather from various sources.

    Tacoma 16” Steel wheels 32lb (original wheels) – according to the wheel spec thread on this site.
    Tacoma 16” Alloy wheels 26lb ship weight. (replaced when I replaced the tires with LT load range E tires) +12lbs total with the new heavy tires.
    Load range E – LT245/75R16 = 46lbs
    Load range C – P245/75/16 = 38lbs (my original tire)

    Truck Curb weight 4190 empty (2008 DCLB 4x4 SR5)
    Truck front axle weight 2300lbs empty
    Truck rear axle weight 1890lbs empty

    LT254/75/16 load range E tire max load at 35PSI – 1700lb (data from Goodyear and Bridgestone)
    LT 245/75/16 Load range E tire max load at 50PSI – 2205lbs (same as P245/75/16 at 29PSI – data from Goodyear and Bridgestone)

    Max new tire rear axle load at 35PSI = 1510lbs (3400lbs – 1890lbs)
    Max new tire front axle load at 35PSI = 1100lbs (3400lbs – 2300lbs)
    So – I will exceed the max payload of the truck (1260lbs) before I exceed the max load of the new tires at 35PSI. No need to run at 50+PSI.
    Also of note – This morning I made a 180 mile round trip to scout a new hunting spot. I took it easy the whole way and managed to pull 23MPG! I don’t expect this from my normal driving habits but it is an encouraging sign none the less.
    To “OffroadToy” I was on a few miles of washboard dirt road today and I could definitely feel the difference – They are “rougher” than the “P” tires – However the steering wheel shake I use to have on dirt roads is GONE. I don’t know why that would be. Might be the new wheels – not sure.
    I'm pretty happy with them so far.
    JJK
     
  14. Jan 20, 2015 at 12:44 AM
    #14
    RKCRUZA

    RKCRUZA Well-Known Member

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    Toyo has a great chart / specs etc on both P and LT tires on their site. The one thing I have noticed with the several charts I have seen on LT tires is that none of the mfg's list a load rating on the charts with less than 35psi inflation. Might be due to the heat issues associated with LT type tires. Have been considering dropping the pressure on the "D" rated LT's that came on my Pro down to 35 to see how it affects things.
     
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