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What amount of air pressure to run in bigger tires?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by SCLOSKEY, Dec 18, 2010.

  1. Dec 18, 2010 at 3:30 PM
    #1
    SCLOSKEY

    SCLOSKEY [OP] Well-Known Member

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    Hey guys, just got a set of 285/70/17s - Hankook Dynapros. The max is can put in is 80 pounds of pressure, but I can't seem to find what the appropriate amount to run in them is ? What are you guys running in your 285/70/17s?
     
  2. Dec 18, 2010 at 3:32 PM
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    cameronlane

    cameronlane Well-Known Member

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    im running 35 in mine toyo open country
     
  3. Dec 18, 2010 at 3:40 PM
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    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    Off topic , but did you get the AT or MT Dynapros ?
     
  4. Dec 18, 2010 at 3:47 PM
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    Brunes

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    Chalk line test- Draw a line across the whole tread and drive a little- See how the chalk wears off. If it's even- That's the perfect pressure for tire wear. If the outsides wear more than the center- Too low-add air. Inside wears off and outsides stay- Too much air- let some out.
    Once you know that "perfect" pressure-You can add air to improve mpgs (to a point) at the cost of a stiffer ride. Less air will give you a softer ride. So it's kind of your call from there.
     
  5. Dec 18, 2010 at 4:35 PM
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    SCLOSKEY

    SCLOSKEY [OP] Well-Known Member

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    I got the AT's
     
  6. Dec 18, 2010 at 4:37 PM
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    Tacomanator

    Tacomanator Boiling denim and bangin whores

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    what load rating are they?
     
  7. Dec 18, 2010 at 5:04 PM
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    DevL

    DevL Well-Known Member

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    Load rating of the tire has nothing to do with how much air you should run in it. Run the factory specs or close to it. The higher load range tires are deigned to be able to air up to a higher pressure IF NEEDED for heavier loads. You wont run loads that heavy so run the correct pressure for your truck... around 30-35 psi. People who do stupid stuff like run 40+ psi are just getting a Fred Flintstone ride for no reason.
     
  8. Dec 18, 2010 at 7:31 PM
    #8
    Gregman

    Gregman Well-Known Member

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    Should be a sticker inside the drivers side door pillar that tells you what psi to run, it's mostly based on the gross vehicle weight rating of your truck. Mine says 29 psi front and rear. The tire manufacturer has no idea what you are mounting their tire to, they just put the maximum pressure the tires are capeable of on the sidewall. Running them way over inflated makes them wear out in the centre as everyone has already said. Start with what is written on the sticker on your truck then do the chalk test to make sure you've got it right, it will likely be a slightly different pressure depending on what type of tire you've got and what size you've got. I run the same pressure in my 265/75R16 as I did in my 245/76R16. Currently I am running 32psi front and 30psi rear.
     
  9. Dec 18, 2010 at 8:38 PM
    #9
    bjmoose

    bjmoose Bullwinkle J. Moose

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    It's not NO reason. They're also prematurely wearing down the center of the tires. :p
     
  10. Dec 19, 2010 at 12:58 AM
    #10
    scott572011

    scott572011 Well-Known Member

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    2010 ass cab stock wheels called 4- 30psi front 33psi rear. peanut wheels!!. 245/75r16nz. i run 35 psi all round seems to be work`n fine.
     
  11. Dec 19, 2010 at 5:56 AM
    #11
    RainDodger

    RainDodger YGWYPF

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    Call the Tire Rack. Ask to talk to their tire pressure expert guy. After you tell him exactly what vehicle you have and your tire sizes, he will calculate for you, what pressures you should be running, based on vehicle weight and internal volume of your new tires. Worked for me.
     
  12. Dec 19, 2010 at 8:15 AM
    #12
    Brunes

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    When you say "worked"- Did you compare to something else or are you just going off the "I'm happy with how it rides and the tires wear looks decent" method??

    To the folks above talking about the door plate-That really only applies with the OEM size tires from the same manufacturer. And even then it can vary a few PSI based on compound composition, time of year, and individual truck options packages/extra gear.
     
  13. Dec 19, 2010 at 8:46 AM
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    george3

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    Good info. Thanks. You a mechanic or just know what U R doing ?
     
  14. Dec 19, 2010 at 10:20 AM
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    Brunes

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    Not a mech...and even saying I know what I'm doing is a stretch. I just have learned a few tricks from some smart dudes and realize that they work.
     
  15. Dec 19, 2010 at 10:29 AM
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    bajaracer

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    im running 285/70/17's BFG's ATand the mechanics at Discount tires told me to keep it at 50 psi for maximum tread life.... not sure becuase ive always had my previous Toyo's AT tires at 33 psi and lasted long time
     
  16. Dec 19, 2010 at 10:41 AM
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    billas333

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    I run 38psi in my 285s.
     
  17. Dec 19, 2010 at 10:54 AM
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    hendooman

    hendooman The Stroker Ace

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    Wow 50? Did you take his advice? I would do a chalk test 50 sounds like a lot. 33 sounds better to me
     
  18. Dec 19, 2010 at 12:06 PM
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    george3

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    Well, thanks for passing them on !
     
  19. Dec 19, 2010 at 4:32 PM
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    skistoy

    skistoy Make mine a Double!

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    just for example:

    I have goodyear Duratrac's 265/75R16, larger than the 245's that came with the truck.

    Did the chalk like test, as i do with all my tires

    Found the best pressure for MY TRUCK, with MY TIRES

    to be 36 p.s.i. up front, 24 p.s.i. in the rear.

    I believe the 24 p.s.i. is because the back end is so light, carbon fiber bed and all.

    have been running this for a couple years now, summer, winter, year round.

    Have had no problems, runs great at highway speeds, haven't got stuck in snow yet.
     
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