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How to determine your new air pressure with LT Tires.

Discussion in 'Wheels & Tires' started by Scuba, Nov 16, 2019.

  1. Jun 17, 2021 at 9:30 AM
    #31
    amajack

    amajack New Member

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    I have bfg ko2 e on 2020 trd off-road. Stock size. Can someone suggest a tire pressure . I’ve read anywhere between 35-55 psi. I have slight outside wear on the fronts running 35 all around
     
  2. Jun 17, 2021 at 11:02 AM
    #32
    Green Thunder

    Green Thunder Smooth in the Cruise

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    The wear is likely from turning, which is normal. Rotate every 5,000 miles and things will be fine.
     
  3. Sep 19, 2021 at 7:47 PM
    #33
    fmscott2

    fmscott2 New Member

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    Getting some 255/70r18 Cooper Discoverer Rugged Treks XL load range installed this week. The size is the exact same as stock but the XL load rating is throwing me off. Don’t tow/haul so what pressures should I run?
     
  4. Oct 4, 2021 at 1:56 PM
    #34
    FortyNorth

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    Green Thunder and AZBoatHauler like this.
  5. Oct 20, 2021 at 7:34 PM
    #35
    TundraNC

    TundraNC New Member

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  6. Nov 9, 2021 at 5:41 AM
    #36
    wexttxco

    wexttxco New Member

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    Fox 2.5 RR, 35x12.5r18 x3 on method 701, armor, front bumper
    Can't get the original chart to work. Does this work for load range e tires too?
     
    Last edited: Nov 9, 2021
  7. Nov 9, 2021 at 5:52 AM
    #37
    fmscott2

    fmscott2 New Member

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    Do a chalk test. That’s what I had to do with my new Cooper Discoverer Rugged Treks after coming up short in online research.
     
  8. Nov 10, 2021 at 4:42 AM
    #38
    jonclark96

    jonclark96 Not so new member

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    I recently added Rugged Treks as well. What did you end up with for tire pressure?
     
  9. Nov 10, 2021 at 5:03 AM
    #39
    fmscott2

    fmscott2 New Member

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    After chalk test I came to 35lb in the front and 33lb in the rear. 2014 Double Cab 2wd bed normally empty. 255x70 r18 size
     
  10. Dec 10, 2021 at 9:26 PM
    #40
    Punisher17

    Punisher17 New Member

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    That tire pressure calculator is awesome. The tire shop out my 33x12.50r18 toyo at xtreme 2 tires at 50psi which is fine for summer but when winter comes I’d put them to 42psi and was worried it was too low. The calculator says 38psi is fine in my case. Glad I found this thread! Thanks guys.
     
  11. Dec 14, 2021 at 4:55 PM
    #41
    sharkmango

    sharkmango New Member

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    @Scuba Could you lend a guy a hand here? I really appreciate the knowledge and consideration you have on the topic.

    2014 Toyota Tundra 4WD
    Originally on 275/65/18
    Now on 285/75/18

    Attached the VIN sticker here - I'm getting new model of the same tires - Toyo Open Country AT III (129S E1)

    Any suggestions?

    1.jpg
     
  12. Dec 15, 2021 at 4:49 AM
    #42
    wexttxco

    wexttxco New Member

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    Fox 2.5 RR, 35x12.5r18 x3 on method 701, armor, front bumper
    Are yall calling these pressures at cold or hot tire temps?
     
  13. Jan 26, 2022 at 8:04 AM
    #43
    RaginTxn

    RaginTxn New Member

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    Ya done messed up..
    Snohomish Co, WA
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    all tire pressures should be done cold.

    As well - here's a handy calculator so you don't have to go through all the different tables and tabs on a browers: Replacement Tire Pressure Calculator - TirePressure.com (takes out the guess work of inbetween pressures). As well, at least with Discount Tire, they provide you the tire pressure you should be using based on your OE specs on your receipt.
     
    NoMoTaco and reywcms like this.
  14. Jul 8, 2022 at 7:12 AM
    #44
    jmay86

    jmay86 New Member

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    Old thread, I know...

    If I've plugged all the info in correct, looks like my factory recommended pressure of 35psi doesn't change when I swap wheels and tires... May be 100% correct but it just seems wrong haha...

    OEM: 265/60r20 112H Falken Wildpeak AT3WA rated at 2185lb @ 35psi (after the 1.1 calculation for P rating)

    NEW: 35/12.50r18 118R Toyo AT3 rated at 2335lb @ 35psi

    Sounds right to you tire gurus??
     
    1Tundra5 likes this.
  15. Jul 8, 2022 at 7:35 AM
    #45
    fmscott2

    fmscott2 New Member

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    I know you want a quick answer, but the best thing to do is just chalk test your tires. It'll take less than 30 minutes of your time. That way you'll know exactly the right pressures for your individual truck. Everyone carries a little bit different weights, gear, accessories installed, etc. that can change the proper pressures.
     
    RaginTxn and jmay86 like this.
  16. Jul 25, 2022 at 6:59 PM
    #46
    1Tundra5

    1Tundra5 New Member

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    Could someone please help me? I didn’t understand the whole calculation thing.
    I purchased these Lt 265 70 18 Load E tires.
    , that say 80 psi is the recommended pressure; and also purchased some 18 inch TRD off-road wheels.
    It originally came with the chrome 20 inch wheels. On my drive here, I actually saw a decrease on MPGs. Wondering what the correct tire pressure should be.
    Original wheel and tire 285-55-20 and air pressure of 49 psi per the door sticker.
    2015 Tundra SR5, in case it matters.
     
  17. Jul 25, 2022 at 7:33 PM
    #47
    14burrito

    14burrito IG @14burrito

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    Where on EARTH did it tell you to run 80?
     
  18. Jul 26, 2022 at 2:42 AM
    #48
    1Tundra5

    1Tundra5 New Member

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    I meant to say, that was the Max psi
     
  19. Jul 26, 2022 at 9:45 AM
    #49
    frichco228

    frichco228 Valued Member

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    use this when switching to smaller, larger or tires with a different load rating than stock -https://tiresize.com/pressure-calculator/

    I am going to guess with that size, E load it will come back around 38psi front and 40 psi rear.
     
    1Tundra5[QUOTED] likes this.
  20. Jul 26, 2022 at 11:24 AM
    #50
    1Tundra5

    1Tundra5 New Member

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    I went to that website, and it’s saying psi of 46.
    For the stock 20 inch wheels and tires, it requires 49 psi per sticker on the door
     
    Last edited: Jul 26, 2022
  21. Jul 26, 2022 at 12:01 PM
    #51
    frichco228

    frichco228 Valued Member

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    you put in all the stock specs of the tire that came on the truck, including the Manufacturer's listed tire pressure and load rating. Then enter the new tire info, size, load, etc...it will give the air pressure for the "new" tires.
     
  22. Jul 26, 2022 at 1:16 PM
    #52
    Oldguy423

    Oldguy423 Bertha is her name

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    some changes too many to list
    Had 5 new Yoko LT275/65 r18 Geolanders put on today replacing the old Falken SL tires. The original tire pressure on VIN tag showed 30-F/33-R - Inputted new tire info on the websire recommended and got 50psi F/R. Installers advised me that the new PSI will be 50 PSI. Nice chart for confirming what the shop told me. TPMS system all reset. I was advised to keep at 50PSI when I tow my TT.
    The 20 mile ride home was outstanding with little to no road noise but I do have the TRD dual exhaust so maybe that why I don't hear the road noise.
    No wobble/shake and surprisingly handles dips and rough road asphalt way better than the old tires.
    I am a happy camper now!!
     
  23. Jul 26, 2022 at 1:19 PM
    #53
    Oldguy423

    Oldguy423 Bertha is her name

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    Thanks for posting. Used it to determine difference of old SL rated to my new LT rated. Matched with shop's recommended PSI.
    Appreciate the info.
     
  24. Jul 26, 2022 at 9:21 PM
    #54
    1Tundra5

    1Tundra5 New Member

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    When you go up by a lot on tire pressure due to it being recommended, does it make it for a bouncy ride? Or would it be about the same as what the ride would be with the OEM tires and wheels?
     
    Oldguy423 likes this.
  25. Jul 26, 2022 at 9:55 PM
    #55
    Tripleconpanna

    Tripleconpanna Just an X who bought Bud Light from Target

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    Handy device.... but check this out!!

    So I enter stock p275/65/18 and the new tire of LT295/70/18, which comes in a C or E load rating. The interesting thing here is that although the 10ply E load rated tire should carry more at max pressure, etc. than the C load rated tire, it recommended a bump of 3psi over placard for EITHER C or E load rated tire to match OE specs....

    I'm not saying the calculator is flawed; I just would have thought it would take a lower PSI on a E load rating to reach the same load capacity as a C rated tire of the same size. Interesting that's all!!
     
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  26. Jul 27, 2022 at 9:02 AM
    #56
    Oldguy423

    Oldguy423 Bertha is her name

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    I found that my LT rated tires at 50PSI (same as calculator and recommended pressure from the shop) actually give a better ride than the old SL rated tires at recommended pressures (30f/33r) which felt every bump or road gremlins. I had very little road noise and steering was responsive with the new tires. My replacements were the Yoko Geolander AT GO15 275/65 r18 E 123/121 from America's Tire. I replaced all 5 as I will be towing a 22 ft. TT and if I had an issue with any tire I would have the same tire for a size/make spare.
     
  27. Aug 13, 2022 at 8:36 AM
    #57
    Malinois38

    Malinois38 New Member

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    Been through 3 sets of Michelin LTX AT2 275/65/18 “E” rated tires on my Tundra. Been running them at 50psi for normal driving & 70psi when towing a 7k travel trailer (980lbs tongue weight). Tread has looked fine till the end and was still not at the wear marks when done. Great tire, could be a little better in the snow. But, overall great tire to run year round IMO. And I’m getting older too!
     
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  28. Feb 8, 2023 at 1:44 PM
    #58
    CTundraForMe

    CTundraForMe New Member

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    This is interesting.

    I had Discount Tire (DT) put LT275/65/R18 123S E1 on my '15.

    I didn't change tire sizes. Just went from P to LT and from SL to E.

    DT reset my tire pressure sensors, and put the pressure in the low 30s.

    According to the one site listed here, I should be at 45PSI. The other at 42PSI. The first link from the OP doesn't work. I didn't take the time to decipher the second one.

    I just checked the pressure on the tires and they are 30 even, and my light is not on.

    Coincidentally DT is rotating/balancing the tires for me in a few days. I'll question them about the pressure.

    Seems like I should inflate to at least 40??
     
  29. Feb 20, 2023 at 5:05 PM
    #59
    Sunfish

    Sunfish New Member

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    I replaced the Standard Load AT2 Michelins and went with 10 Ply E rated AT2 Michelins. I started out at 50 and it was wearing a little in the center and I let them down to about 42 PSI. They were singing and really stiff on the bumps at 50 PSI. I don't haul anything heavy and it's like a 4-door car with a big trunk to me. It has an Undercover and a Bedrug, but I doubt they weigh over 300 pounds. I may end up letting them down a little more before it's all over
     
  30. May 15, 2023 at 8:26 PM
    #60
    Sleeper16plat

    Sleeper16plat New Member

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    I will have to read this again when I get new tires!

    thanks for sharing, I had no idea tire pressure was so complicated!!
     

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