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Rim Offset?

Discussion in 'Early CJ5 and CJ6 Tech' started by greencj5, Apr 12, 2005.

  1. Apr 12, 2005
    greencj5

    greencj5 Member

    So. California 91016
    Joined:
    Nov 14, 2004
    Messages:
    165
    I have to take the plunge for new tires soon. I'm considering B.F. Goodrich M/T's size 32x11.50 - 15. I have 15-10 rims ( from my long gone F-150) with 33 x12.50's on now. I don't know the offset on these rims but I think that they will be a little wide for the new tire and they now rub the springs on sharp turns. I'd like to go with a 15x8 rim and would like to get an idea on what the proper backspacing should be. Thanks for the help. :coffee:
     
  2. Apr 12, 2005
    MOP

    MOP Active Member

    Manhattan, KS
    Joined:
    Sep 25, 2003
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    1,133
    Don't quote me, but I think standard is 3.75"
     
  3. Apr 12, 2005
    panzer

    panzer Super Mod Staff Member

    Columbus, OH
    Joined:
    Dec 9, 2003
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    1,242
    I got 15x8's w/ 4" backspace. Running 31x10.5's.Works quite well. Doesn't rub on turns.
     
  4. Apr 12, 2005
    Old Bill

    Old Bill Aggressively passive....

    Really Southern...
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    Nov 12, 2004
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    822
    Oddly enough, I went through this with my local Discout Tire. Their "standard" backspace is listed as 3.75", but the actual measurement is 4.00". I'd personally measure the rim for backspace rather than rely on the numbers in the catalog just to be sure.

    Check out....
    http://www.bfgoodrichtires.com/assets/pdf/mud_terrain_ta_km.pdf

    "section width" will be helpful. With this, you should be able to do the math and figger out what would work for you. For example, if you're running 12.5's and are going to 11.5's, you'll gain .5" clearance with the same backspacing and same width rim.

    Also see....
    http://www.rsracing.com/tech-wheel.html

    for how to measure offset, backspacing, etc.


    HTH
     
  5. Apr 12, 2005
    jd7

    jd7 Sponsor

    Nacogdoches,Texas
    Joined:
    Mar 30, 2004
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    Depending on when your wheels were made the backspacing will be from 3" to 4" in the old days most 10" wide had 3-3 1/2" backspacing, most 5 on 5 1/2 rims are backspaced for Dodge pickups now and are gonna be 3 3/4 or 4" . I have run 11.50 on 10" rims with no problems even with 10.50 on 10" rims only lost bead if aired down less than 10# but I probably didn't push as hard as some. Maybe adjust steering stops to allieviate "rubbage"?
     
  6. Apr 12, 2005
    Mudweiserjeep

    Mudweiserjeep JEEP: Bouncy and Fun

    tipp city, ohio
    Joined:
    Jun 17, 2004
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    719
    If someone was to go with more backspacing.........would this give the jeep a wider stance? Does more backspacing position the tires out more?
     
  7. Apr 12, 2005
    Old Bill

    Old Bill Aggressively passive....

    Really Southern...
    Joined:
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    Yes, backspacing affects how far out the tires sit. The LESS backspacing, the FURTHER out the rims sit from the center of the vehicle.

    The MORE backspacing, the CLOSER the rims sit to the center of the vehicle.

    See
    http://www.rsracing.com/tech-wheel.html
     
  8. Apr 12, 2005
    greencj5

    greencj5 Member

    So. California 91016
    Joined:
    Nov 14, 2004
    Messages:
    165
    Good points JD7 - that is a concern of mine 'bout the 10" rim losing the a bead when aired down. I don't think I'd find myself below 10 psi often and I tend to drive on the conservative side because I hate to pay for repairs. The rims I have are fine and maybe an 1" narrower tire could only help minimize the rubbing - right?
     
  9. Apr 12, 2005
    iamgeer

    iamgeer Member

    Calgary,...
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    Jan 30, 2004
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    Be careful, not all ford 5 on 5.5 fit Jeeps.

    Karl
     
  10. Apr 12, 2005
    jd7

    jd7 Sponsor

    Nacogdoches,Texas
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    Mar 30, 2004
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    In aftermarket wheels most have the 4 1/4 center so they can.
     
  11. Apr 12, 2005
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
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    Sep 10, 2003
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    2,069
    when i got my new tires, the guy on the phone asked if i had locking hubs, because the hole is bigger.
     
  12. Apr 12, 2005
    Boyink

    Boyink Super Moderator Staff Member

    Ava, MO
    Joined:
    Sep 20, 2002
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    5,000
    Not $tocktons. :rofl:
     
  13. Apr 12, 2005
    jd7

    jd7 Sponsor

    Nacogdoches,Texas
    Joined:
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    I guess I was speaking of ones such as American and the type you can buy for a weakly payment at Ottasco. I bought some from 4Wheel Wholesellers to get an offset that I wanted and they ask me to specify the center whole diameter and what they were going on, but that was what I think of as a semi custom option. Stockton is more of a custom option, at least in my book. I think of Stockton as a custom manufactorer of wheels. Those that only want the best and are willing to pay for it are the only ones with Stockton wheels, right :D
     
  14. Apr 12, 2005
    Boyink

    Boyink Super Moderator Staff Member

    Ava, MO
    Joined:
    Sep 20, 2002
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    5,000
    I just couldn't find a set of 8" KH wheels when I wanted them...so bought the Stockons, which came with the Ford center hole by mistake.
     
  15. May 2, 2005
    razorsedge

    razorsedge jeeppaul

    Middleburg, FL
    Joined:
    Apr 23, 2005
    Messages:
    27
    I run 33X13.50's on 10 inch X 2.5 backspaced rims and they do not rub anywhere.....I have flexed it very hard and bumped the back corner of the fender on the rear.
    My old 33X12.5 on 10 inch with 3.75 backspacing rubbed the fenderwells in the rear....
     

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