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what air pressure to run?

Discussion in 'The Garage' started by xpndbl3, Oct 18, 2006.

  1. xpndbl3

    xpndbl3 1/2 ton status

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    My truck has a 6" lift, 315/75R16s, they're Pathfinder all terrains basically. Been running them near max pressure for trailering my car and 1600 pound trailer, but for regular street driving what pressure should I run? 25, 30 ??

    88 suburban 3/4 ton.
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    I run between 35-38 psi on mine for street driving. The last set of tires i had went 50K miles and even tire wear.
     
  3. goldwing2000

    goldwing2000 Guest

    Since most of the time I have basically no load in the vehicle, I run 28 front, 25 rear in my 35x12.50-15s. If I plan to carry a bunch of stuff or tow a heavy trailer, I'll bump it up to tire max for the duration of the trip.

    There was some guy who actually verified the best tire pressure by inflating to a certain point, driving for a while and then getting out and checking the temperature across the tread. His final determination was 28psi on a 35" tire.
     
  4. k20

    k20 3/4 ton status

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    I run 30 in the front, 25 on the back of my SSR's. I love it when I say that to someone and they try to argue that you have to run what is printed on the side of the tire. Sorry Im not running 65psi (good ole E rating tires) on an unloaded truck.
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Pathfinders were on my truck when I bought it . They chunked easily . Went with Sport Kings made by BFG , and no chunking . I have actual BFG's now .

    Anyway , I run 35 psi street now that I have 35's . I was aired down to 28-32 on the 33's . More sidewall makes a better ride . I usually air down to 20 when I play , but I am going to go lower from now on .
     
  6. AZ79K5Project

    AZ79K5Project 1/2 ton status

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    The recommended tire pressure should be listed on the VIN plate on the B-pillar or glove box. This is the manufacturer's recommended pressure for the truck. Its a good place to start.

    The tires have their own rated max pressure. My DD is a Ford. I run them a little higher than door sticker. Max pressure is too hard of a ride. Recommended VIN pressure is too soft for my liking.

    My K5 - I'm just happy they have air.

    I keep them around 30.
     
  7. goldwing2000

    goldwing2000 Guest

    That pressure only applies if you have the same size tire as listed on the placard. If you have bigger aftermarket tires, your pressure will change.

    Even so, Ford is notorious for recommending tire pressures that are too low in order to make the ride softer to please the yuppies. That was one of the biggest causes for the whole Firestone fiasco. The recommended pressure was WAY too low and it made the tires heat up too much.
     
  8. fabjunkie

    fabjunkie 1/2 ton status

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    This is what I said in a previous post just like this one.

     
  9. fabjunkie

    fabjunkie 1/2 ton status

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    And this was added on....

     
  10. goldwing2000

    goldwing2000 Guest

    That's pretty much what I said! :D
     
  11. az-k5

    az-k5 1/2 ton status

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    Paul run about 27 on the front and 25 on the rear. They will wear better that way.

    As for the original poster,

    It depends on your wheels. I would say somewhere around 37-40psi if you have a 10" rim and 28-35psi if you have 8" wheels.
     
  12. gmc4cw

    gmc4cw 1/2 ton status GMOTM Winner

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    I run 32 psi when I'm empty. take it up to 40 when towing.
     
  13. xpndbl3

    xpndbl3 1/2 ton status

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    guess i'll be dropping down the pressure a little bit since running 40/50 right now is rough on the body bouncing everywhere in my seat. Going to try 32-35 amd see how that works out for me.
     
  14. NoReGrEtS

    NoReGrEtS 1/2 ton status

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    shouldn't you mark the tires with chalk and drive around the block and check the contact and adjust air presser to get full contact
     
  15. xpndbl3

    xpndbl3 1/2 ton status

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    i don't know...never heard of the chalk thing before...?
     

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