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  1. #1
    Jr. Mechanic
    Join Date
    Oct 2006
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    Hotlanta
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    87

    Default Tire Presure? [Expired Topic]

    Door jam says front tires 45/rears 80 psi. Sidewalls of my Bridgestones say max. 50 psi. My replacement tires are same size as factory specs., so which do you go by?

    Roger
    Roger
    Hotlanta
    "Home is where the heart is and my heart is at home" L.S.
    2003 Yukon XL 4x4 w/5.3L
    RIP --- 1996 GMC Suburban 2500 w/454 -- 5.14.7
    1987 31' Holiday Rambler TT
    Best Song Ever: "Hey Porter" J.C.

  2. #2

    Default RE: Tire Presure?

    You sure your not reading that wrong?

    Thats real high.

    I know when I used the Burb to pick up baged shavings, I would run 60 psi.

    But then I had 30 bags of shavings in it, not sure of the weight, but the tires looked flat so I would put 60 or so in and they looked right.

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesn’t.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
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    See a Pattern yet?

    15 year GM assembly line worker.

  3. #3
    Jr. Mechanic
    Join Date
    Oct 2006
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    Hotlanta
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    87

    Default

    I double checked and label puts cold psi at 45/80 front/rear. The 45 psi seems reasonable for the front, but I can't imange ever running rears at 80 psi.

    Do you run all your tires at the same psi for everyday driving? Do you increase rear pressure when they are under load? I'm really just trying to determine the best combo for these 2 different driving condidtions so I can get best handling and fuel economy.

    Thanks,
    Roger

  4. #4

    Default

    I run about whate the label says for every day driving, but that does seem a little high.

    On the other hand are the tires you got rated LT (light truck)?

    I still think that is high for the rear pressure.

    I'm going out and see if mine is readable right now.

  5. #5

    Default

    Just looked the label is all washed out.

    I looked in the owners manual and it just says never inflate over the recomended pressure on the tires.

    But then on the next page it also says.

    If you have 16 inch tires on your vehicle, and


    You'll be driving for very long at speeds of 66 mph to 75 mph where legal, inflate tires to 10 psi more than recomended cold inflation

    Sounds funny to me but then who knows, maybe someone else here knows more.

  6. #6
    Jr. Mechanic
    Join Date
    Oct 2006
    Location
    Hotlanta
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    87

    Default

    Yeah, my Bridgestones are LTs. I guess its best to stay within the PSI on the tires no matter what the label on the door jam says? :? Anyway, I'm still curious what PSI others have found to be the best for everyday driving and towing.

  7. #7
    Sr. Apprentice
    Join Date
    Jul 2006
    Location
    Spokane, WA
    Posts
    42

    Default

    My 94 2500 has 40 psi front and 50 psi back for up to 8 persons and 200 lbs. Above that the recommended pressure is 80 psi front and back. If your tires are not rated for 80psi then most likely you don't have the 10 ply Loadrange E rated tires. I assume your 'burb is rated 8600 lbs maximum weight. Those normally have E rated tires. The loadrange is imprinted on the sidewall of the tire. I would in any case not put more pressure into the tire than the sidewall says.
    Andy
    Spokane, WA
    1994 Chevy Suburban K2500 7.4 4WD

  8. #8
    Sr. Apprentice
    Join Date
    Jul 2006
    Location
    Spokane, WA
    Posts
    42

    Default

    The 40/50 pressure is very nice for normal everyday driving. My 3/4 ton is more comfortable than my brother in law's 2 door tahoe. Any higher though and the ride gets really bumpy. For heavy towing the high inflation is better.

  9. #9
    Jr. Mechanic
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    Oct 2006
    Location
    Hotlanta
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    87

    Default

    My LTs are load rated "C". Currently have fronts at 45psi a & rears at 50psi. As I said earlier the max psi on the tires is 50. With the psi I'm running at now it feels like I have boulders for wheels (no load). I guess I'll drop the pressure all around a bit. Any suggestions?

  10. #10
    Newbie
    Join Date
    Nov 2006
    Location
    Farmington, CT
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    4

    Default

    Hello, I'm new to the site so I'm coming into this a bit late... I had a 92 K2500 suburban that required 10ply tires. The door jam also recommended a similar tire pressure around 80 psi in the rear and lower in front. The key was getting 10 ply tires rated for the load and pressure. I recently sold that truck and got my 97 K1500, then put new 10 ply Firestone destination M/T tires on it. Now I don't know what to keep the pressure at. The door jam pressure is low (around 35 i believe), but that is for the recommended 6 ply tires. What should I keep the new 10 ply tires at?

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