Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Optimum pressure for BFG AT KO's...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Burbinator, Nov 23, 2001.

  1. Burbinator

    Burbinator 1/2 ton status

    Joined:
    Sep 14, 2001
    Posts:
    898
    Likes Received:
    0
    Location:
    Tempe, Arizona
    Optimum pressure for BFG AT KO\'s...

    I'm sure this has been asked 1000 times...here goes 1001.

    Looking for the optimum pressure for my BFG's for the STREET. I am getting conflicting numbers from various persons that don't wash with my own "magic" number.

    Interested in your opinions...TIA

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://photos.yahoo.com/abshort1>U.S.S. Nimitz II</a>
     
  2. 1979Jimmy

    1979Jimmy 1/2 ton status

    Joined:
    Nov 14, 2001
    Posts:
    696
    Likes Received:
    0
    Location:
    Danville Ca
    Re: Optimum pressure on BFG AT KO\'s...

    35psi

    79 Jimmy, 5" lift 35 M/T with a 383 puttin out 400hp and 450lb/ft. Locked front and back.
     
  3. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

    Joined:
    Jan 21, 2001
    Posts:
    20,716
    Likes Received:
    2
    Location:
    Undisclosed Location
    Re: Optimum pressure for BFG AT KO\'s...

    Minimum pressure should be 80% of the rated pressure which is 28 psi. I run about 32 on mine for the street, but always run 35 highway.

    Bubba Ray Boudreaux,
    "If I had wanted a plastic ride, I'd married Pamela Anderson."<a target="_blank" href=http://community.webshots.com/user/mdntrdr1>http://community.webshots.com/user/mdntrdr1</a>
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

    Joined:
    Feb 17, 2000
    Posts:
    7,385
    Likes Received:
    0
    Location:
    Atlanta
    Re: Optimum pressure for BFG AT KO\'s...

    Depends on the size. Some tire sizes are rated 50PSI. The 31's and 32's that I have are rated 50 psi. problem is the factory rally rim is rated 40 psi. I have been running 36 front and 34 rear on the K5's and getting good even wear. With the extra weight of a Burb I would say run 36 F/R or 38 F/R if that's the size you have.
    If you have the tires rated 35psi max then I would say about 32.

    Women dig dents and flat paint!
    coloradok5.com/gallery/Grim
    75 Jimmy, Dollar
    Grim-Reaper
     
  5. mike reeh

    mike reeh 1/2 ton status

    Joined:
    Jul 23, 2001
    Posts:
    752
    Likes Received:
    0
    Location:
    San Diego, CA
    Re: Optimum pressure for BFG AT KO\'s...

    my 33" ko's tend to like about 25-28max for a good ride.. they wear perfectly and dont squat, etc. any more and its bouncy bouncy.. if you have uber-soft suspension, 32 will work for you

    mike
     
  6. Itali83

    Itali83 1/2 ton status

    Joined:
    Feb 12, 2001
    Posts:
    795
    Likes Received:
    0
    Location:
    Westbrook Maine
    Re: Optimum pressure for BFG AT KO\'s...

    I run 50 in my 31 10.5 15's on stock ralley rims. Mine are wearing perfectly, no cupping on the front or rear and just a hint of feathering on the fronts after 10K miles. I love my BFG AT KO's
    Ben 87 Jimmy
    <font color=blue>Rust=Bad</font color=blue>
    <a target="_blank" href=http://www.bens87toy.alloffroad.com>www.bens87toy.alloffroad.com</a>
     
  7. Burbinator

    Burbinator 1/2 ton status

    Joined:
    Sep 14, 2001
    Posts:
    898
    Likes Received:
    0
    Location:
    Tempe, Arizona
    Re: Optimum pressure for BFG AT KO\'s...

    That's what I thought, around 35 psi. I usually run the rears at 42 when towing my boat or tent trailer, when I think about it. I haven't had any problems. 42 psi seems to roughen the ride a little when all four are at that pressure.

    My tires are 31 X 10.5 X 16.5. I've had some buddies who have suggested 45-50 psi for optimum pressure. Apparently, they have never taken a ride in the truck afterward!

    Thanks everyone for your input...

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://photos.yahoo.com/abshort1>U.S.S. Nimitz II</a>
     
  8. RedDwarf

    RedDwarf 1/2 ton status

    Joined:
    May 9, 2001
    Posts:
    816
    Likes Received:
    0
    Location:
    North Central Florida
    Re: Optimum pressure for BFG AT KO\'s...

    Grim is exactly right. The others are not helping you to answer your question without knowing the size of your tires as well as the gross weight of your vehicle(that includes all cargo you are carrying/towing).

    Generally, the bigger the tire, the less pressure is needed for the same weight.
     
  9. CV202

    CV202 1/2 ton status

    Joined:
    Nov 14, 2000
    Posts:
    454
    Likes Received:
    0
    Location:
    Kingfield, ME
    Re: Optimum pressure for BFG AT KO\'s...

    Been running my 33x12.5x15 AT/KO's at 42psi w/o a complaint. They're wearing even and the ride is smooth. The psi will be dropped to 32 for the winter driving ordeal however.

    Why do people keep calling it a Bronco!!!!! [​IMG]
     
  10. shawnboy

    shawnboy 1/2 ton status

    Joined:
    Jun 22, 2001
    Posts:
    468
    Likes Received:
    0
    Location:
    Toronto, Canada, eh.
    Re: Optimum pressure for BFG AT KO\'s...

    I run my 33X12.50X15 BFG MT KOs at 35 Lbs. When on roaad and down to 15 lbs. or less for play. No problems.
    Shawnboy.

    <font color=red>If you are having too much fun it's probably illegal.</font color=red>
     
  11. Burbinator

    Burbinator 1/2 ton status

    Joined:
    Sep 14, 2001
    Posts:
    898
    Likes Received:
    0
    Location:
    Tempe, Arizona
    Re: Optimum pressure for BFG AT KO\'s...

    See my previous for tire size, 6000 lbs approx. average weight (normal use duty) of truck. Figure on 2000lbs for my tent trailer (a vintage 1970 Starcraft) and 3500 lbs for my boat.

    I'm more focused on everyday usage vs. towing with regards to inflation pressure.

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://photos.yahoo.com/abshort1>U.S.S. Nimitz II</a>
     

Share This Page