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  1. #1

    Default Tire sizes, how big?

    What's the biggest tire size I can fit on my 'burb without lifting it? I'm not opposed to doing a "little" bit of grinding either.


    '94 Chevy Suburban K1500
    3" exhaust w/ aero turbine non-baffled muffler
    CFM Technologies TB spacer
    CB w/ 44" whip antenna

  2. #2


    The standard answer for the OBS K1500's is about 33 inches (285x75R16).
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  3. #3


    Thanks. What's OBS?

  4. #4


    Quote Originally Posted by ct9a View Post
    Thanks. What's OBS?
    "old body style"

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  5. #5


    As noted, it stands for "old body style" specifically referring to the '88-'98 style (which spills over into '99 and maybe 2000 model years in specific cases).

  6. #6


    Learn something new everyday. Thanks.

    Edit: Anyone know how much 33's will throw the speedometer off? Anyone know how to fix the speedometer on an OBD I?
    Last edited by ct9a; 08-03-2008 at 12:17 AM. Reason: See post

  7. #7


    superlift makes a reprogrammer for it i believe. i ahd 33's on my truck and when i was going 70 on my speedo i was really goin 75
    95 GMC Sierra 2500
    3" Body Lift, 33" Goodyear MTR's
    5.7L 350 TBI Edelbrock SDT Exhaust, Flowtech Headers, K&N Intake
    Sold :(
    1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
    2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust

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  8. #8


    Should be reading about 7.5% slow with the 33's, if I used the calculator right.

  9. #9


    So I was thinking (uh oh), what is it that's limiting the tire size to 33's? Is it the fenders or the fender wells, or both?

    I've been contemplating cutting out some of the fender anyway and putting on these:

    Would this get me the clearance for larger tires, or am I limited by the inner wheel well?

  10. #10


    Checking around, the pundits proclaim: "No modification is necessary for tire sizes up to 265/75R16 (10x31.7). No modification is necessary for 285/75R16 (10x32.8) unless the wheel has a backspace of less than 4 1/2". Sizes larger than 285/75R16 require a lift kit."
    The backspace requirement indicates that wheel well rub is the first critical factor. There's always the possibility of a spacers before you start with a lift kit and different wheels.
    Are we having fun, yet?

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