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What psi should i run?

Discussion in 'Wheels & Tires' started by TacoTRD420, Sep 10, 2009.

  1. OZ-T

    OZ-T All of those moments....will be lost.....in time

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    You're running your tires at 75 PSI ?
     
  2. Mi Vida Taco

    Mi Vida Taco Well-Known Member

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    Yes i have, i air down when i go offroading, usually to around 45-50. im still a little new to offroading. But i havnt had any issues, my mileage is fine, only lost about 1 mpg when i went with the 265 duratracs. i had a slow leak due to a nail and it got down to about 30 psi or so and it was definatly flat, like im pretty sure there is no way that would be safe for driving. so is it really 28-40 psi everyone is running constantly?
     
  3. OZ-T

    OZ-T All of those moments....will be lost.....in time

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    I run my E-rated Hankook MT's at 38 psi , they also have a max inflation of 80 psi .

    No issues with tire wear .
     
  4. Crom

    Crom Time is precious; use it wisely

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    Wow! @ 75 psi your ride must be extremely harsh. I have the Duratracs in load range C and I run 32 psi up front and 29 in the back all day every day.

    If I want to air down for off roading then I'll go to down to 20 or 18 psi.
     
    Last edited: Jan 3, 2015
  5. Mi Vida Taco

    Mi Vida Taco Well-Known Member

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    I havnt noticed the ride being harsh what so ever. And like i Said due to a leak my tires have gotten that low and seemed to flat to drive around on. I will have to take another look at it all. Im deployed right now and in the process of deciding on new tires. It looks like im going to keep with the duratracs although i wasn to impressed with how they lost a lot of pretty huge chunks. but in this texas heat and that soft of a tire its to be expected. Overall the tire did outstanding! the only other options i was considering was the hankook dynapro m/t or the bfg km2. its been tough to decide on which to get, they all have pros and cons. i will also be doing the chalk test as well. thanks for the help and at least i wont have the pain in the ass issues with finding decent gas station air machines that work well enough to get me up to 75 psi! i would usually have to go to several stations after an offroading trip to find one that worked.
     
  6. dan0

    dan0 Well-Known Member

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    32-35psi max
     
  7. CUtacomaTIGER

    CUtacomaTIGER Unprofessional Driver

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    on my 01 with nitto 265/70R16 i run around 27-28 psi. The pressure got up to 35 psi before b/c I didn't check it in a while and the ride felt extremely stiff (more so than usual). The fact that there 6 ply tires doesn't help the comfort either. FYI inside of my door says 26 all around
     
  8. Phlip4x4Sport

    Phlip4x4Sport Well-Known Member

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    This is one of the symptoms of overinflation... Your tire at 75 PSI has no give to it. Instead of re-shaping itself around a small hard object you are chiseling into the tire and losing chunks.
     
  9. OffroadToy

    OffroadToy The dog did it...I swear!

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    The maximum psi shown on the side of your tire is just that...the maximum. The only time you might need to go up close to that psi would be if you were driving alot bigger truck and carrying an extremely heavy load. For normal driving/best tire wear you should be down somewhere around 32-36psi. Look again at the side of the tire... it will more than likely show a maximum load associated with the maximum psi. Being our trucks are light (especially without a load in the bed) doing the chalk test will show the center of your tire is what's mainly contacting the road at 75 psi.
     
  10. OZ-T

    OZ-T All of those moments....will be lost.....in time

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    75 PSI is way too much my friend .

    You have tires on your truck rated to carry a much heavier vehicle and if that vehicle was unloaded it still wouldn't inflate to anywhere near 75 PSI .

    You would only consider filling the tires to max PSI , or roughly 90 % of max PSI in your case , with a much heavier vehicle that was loaded to it's max payload , and even then you would reduce pressure after losing the load .

    Edit : what OffroadToy said above , lol
     
  11. CUtacomaTIGER

    CUtacomaTIGER Unprofessional Driver

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    yep the higher the load index # on your tire likely the higher max psi. my tires are somewhere between a 114 and 120 if i remember correctly and as such are also 6 ply to give better strength and so higher max psi to carry heaviest loads. but rarely would you ever use max pressure

    check this link to wiki on tire code
    http://en.wikipedia.org/wiki/Tire_code

    when in doubt wiki it
     
  12. 85okhai

    85okhai Well-Known Member

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    just got some toyo proxes st 265/50/20 max psi is 50. had they tire pressure light turn on so i took it back to the tire shop that put my tires on. they dropped the psi to the stock tire psi which is 29 to try and see if the light would turn off, tire pressure light didnt turn off so what should i do? am taking the truck to the dealership to get an oil change so should i just get them to reset it? also what psi would you guys recommend me run?
     
  13. whippersnapper02

    whippersnapper02 Well-Known Member

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    Too high of pressure doesn't set the light off. Low pressure will set the light off. Do a chalk test to see what pressure works for you then reset the system with the button under the steering column following the owner's manual. If it doesn't work check the shop may have damaged a sensor. Also check the spare tire pressure just in case.
     
  14. Climber

    Climber Well-Known Member

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    I agree, that's WAY too high. I run Load range C Revos (no longer made) that are the same weight as the LR Es, so I suspect pretty much the same tire. 36 lbs is plenty in a truck this light and they run nice and cool. I let them down to about 30 on rough roads and then just keep speed down when I'm back on the highway until I have a chance to air them back up. Any higher than 35-36 and you are just hammering your suspension, frame, and body attachment points for no reason, not to mention increasing your chance of an offroad tire puncture from a sharp rock. Remember, LT tires in typical sizes for a Tacoma can carry more than twice the weight of a Taco that's loaded to its max permissible gross weight.

    If you have LT tires, you do need to run a little higher pressures than the stock 30 lbs on the highway. With so much more material in the tire, they will run too hot otherwise, not to mention the rolling resistance sucks.
     
  15. lilred

    lilred Member

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    Great advice
     
  16. Mi Vida Taco

    Mi Vida Taco Well-Known Member

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    it was just due to inexperience on my part, im still fairly new to off roading and all. I do appreciate all the feedback, and positive feedback as well, its still one of the biggest reasons i love owning my taco, all the awesome people on this site! i was merely taking advice (bad) from over 10 years ago, and that was when i was just driving a normal car and all on the streets. but live and learn, just wish it didnt take so long on the learning process!
     
  17. UH60Hwkdrvr

    UH60Hwkdrvr Well-Known Member

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    I emailed BF Goodrich and here is what they advised:

    2011 Taco 4x4 DC w/BFG TA/KO 265/75R16

    45 PSI front
    48 PSI rear

    I took their advice and set the pressures accordingly. The vehicle rides fine.

    m.a.c.
     
  18. Tepidy

    Tepidy Well-Known Member

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    I run bf goodrich M/T KM2's in 265-75-16 and run 35psi on all 4. Came to this using the chalk line. My tires have a max pressure of 80psi
     
  19. teamfast

    teamfast Get busy living, or get busy dying.

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    Excerpt from: http://www.fourwheeler.com/techarticles/wheels/129_1104_tires_and_fuel_economy/viewall.html

    Bigger Tires, New Pressure
    Once you install oversized tires, the OE-recommended pressures on the tire placard, or in the manual, are no longer valid because the internal volume of the tire has changed. Here's how you can translate those OE tire pressures to a new tire and give yourself a starting point. Increased volume usually requires less pressure to carry the same weight in the same class of tire because it isn't air pressure holding the tire up, it's air volume.
    First, you need to find the Tire and Rim Association load inflation table (LIT) for the size and type of tire you are switching from, and to. If you Google "Load Inflation Tables," you will find many sources of such info. The tire manufacturers will also supply this information directly, and tire shops often have it.
    Step 1: Look at the tire placard on your vehicle (or owner's manual) and write down the pressures listed for the stock tires. In our case, they were 50 psi front, 60 psi rear for LT245/70-17 tires, which will be our example. Those are the pressures listed for the truck to carry a rated capacity load, but yours lists both loaded and unloaded specs; either will translate.
    Step 2: Look up the old tire on the load inflation table and note the weight each tire is rated to carry at the psi rating you want to translate, in our case 50 and 60 psi.
    Step 3: The LIT is broken up into 5psi increments, and your recommended pressure may fall between. Yes, it matters. If that happens, you will want to determine how many pounds of weight that 1 psi will carry. Let's say your pressure is 47 psi and you are going to do the same tire swap we are. The weight rating at 45 psi is 2,010 pounds, and at 50 psi it's 2,205 pounds. Use the following formula:
    2205-2010 lb.= 195 lb. = 39 lb. per psi50 psi-45 psi 5 psi
    Subtract 45 from 47 and you have 2 psi. Multiply 39 x 2 = 78. Add 78 pounds (2 psi worth of weight) to the 45psi load rating and you get 2,088 (2,010 + 78 = 2,088). That's the load the tire can take at 47 psi.
    Step 4: Look up the new tire on the LIT. Find the pressure needed to hold up the same weight at the rated placard pressure. Our new LT285/70-17 tires can carry 2,105 pounds at 35 psi, so using the formula in Step 3, we know that to support 2,205 pounds, we need 38 psi. In back, our 60 psi load rating dropped to 44 psi with the larger tires.

    Using the attached Load Inflation table I calculated that I should run 40 PSI with my 275 70 17s. I have been running 31.

    Try it and see what psi you get.
     

    Attached Files:

  20. Syntonization

    Syntonization AK LED Guy

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    Does everyone running over 35 psi, have the tpms alarm on?
     
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