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pressure in tires

Discussion in 'Early CJ5 and CJ6 Tech' started by friendxconnect, Feb 19, 2006.

  1. Feb 19, 2006
    friendxconnect

    friendxconnect Member

    Joined:
    Oct 24, 2005
    Messages:
    88
    Hello Jeepsters,
    I have 4 BF Goodrich Radial Mud-Terrain T/A 31x10.50 R15 tires on my cj5.
    Can anyone tell me the pressure I have to get in the tires front and rear, on road and offroad.
    Tanks
    Bruno
     
    friendxconnect, Feb 19, 2006
    #1
  2. Feb 19, 2006
    willysnut

    willysnut Banned

    Newnan, Ga.
    Joined:
    Oct 8, 2003
    Messages:
    654
    Off road I run 15psi F/R, street 30 psi. I have 31x1050s.
     
    willysnut, Feb 19, 2006
    #2
  3. Feb 19, 2006
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
    Joined:
    Sep 20, 2002
    Messages:
    6,197
    Best to find out for yourself.

    Get some chalk, and draw some chalk lines across your tires. Now go out and drive around some, making sure to get a good "sample" of turns, etc.

    Now see where the chalk remains, and adjust tire pressure accordingly (less if chalk remains in the center, more if chalk remains on the outer edges).

    You want the pressure that wears the chalk off evenly - and it will likely be different front and rear.

    It'll likely be lower all around than you expect - big tires plus lightweight Jeep means not much air required to get even tire wear.
     
    Boyink, Feb 19, 2006
    #3
  4. Feb 19, 2006
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,360
    What Mike said.... I run 32X11.50's, and run about 20 in the rear and 23-24 in the front. I *usually* don't air down off road, but when I do, I drop to 10 PSI or so....
    When I load the Jeep up with several days worth of camping gear, I'll bump the tires up to 26 or so if I have some highway miles to travel..
     
    Patrick, Feb 19, 2006
    #4
  5. Feb 19, 2006
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
    Joined:
    Sep 10, 2003
    Messages:
    2,084
    I run 15-17psi offroad. easier to let air out then put it back.
     
    66cj5, Feb 19, 2006
    #5
  6. Feb 19, 2006
    Gixx

    Gixx Member

    Albuquerque, NM
    Joined:
    Mar 28, 2005
    Messages:
    111
    I'm running BFG 33x12.5x15's on 8" wheels and run 16psi on the street (around town) -
    That is what gave me an "even" footprint.
     
    Gixx, Feb 19, 2006
    #6
  7. Feb 19, 2006
    Posimoto

    Posimoto Hopeless JEEP Addict

    Minden, Nevada
    Joined:
    Aug 7, 2003
    Messages:
    4,538
    20 - 22 lbs on road, 9 - 11 lbs offroad works for me.
     
    Posimoto, Feb 19, 2006
    #7
  8. Feb 19, 2006
    hudsonhawk

    hudsonhawk Well-Known Member

    North Texas...
    Joined:
    Feb 4, 2005
    Messages:
    1,939
    Sounds familure. 35x12.5 MTRs 17 lbs on the street and 7 lbs on the trails.
     
    hudsonhawk, Feb 19, 2006
    #8
  9. Feb 20, 2006
    Chuck

    Chuck Sponsor

    Southshore Ma
    Joined:
    Sep 19, 2004
    Messages:
    1,463
    Another alternative is to weigh your jeep on a scale at the local gravel pit or landfill station, if you don’t know the guy it will cost you about $5. Once you know the weight of your jeep with fuel/accessories call up the company of which brand tire you have they will have a tire air pressure chart and will tell you what they recommend for on road use.

    While you’re at the scale weighing both axles for correct tire pressure take the time to weigh the front and rear separately so that you may get a better idea how well balanced your jeep is.

    Make sure you have the tire company send you a copy of the tire pressure chart.
     
    Chuck, Feb 20, 2006
    #9
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