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Tire sizes, how big?

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by ct9a, Aug 2, 2008.

  1. ct9a

    ct9a Epic Member 5+ Years 1000 Posts

    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.
  2. MrShorty

    MrShorty Epic Member Staff Member 5+ Years 1000 Posts

    The standard answer for the OBS K1500's is about 33 inches (285x75R16).
  3. ct9a

    ct9a Epic Member 5+ Years 1000 Posts

    Thanks. What's OBS?
  4. retired2001

    retired2001 Epic Member 5+ Years 5000 Posts

    "old body style"
  5. MrShorty

    MrShorty Epic Member Staff Member 5+ Years 1000 Posts

    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. ct9a

    ct9a Epic Member 5+ Years 1000 Posts

    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: Aug 3, 2008
  7. Pete95Sierra

    Pete95Sierra Epic Member 5+ Years ROTM Winner 1000 Posts

    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
  8. retired2001

    retired2001 Epic Member 5+ Years 5000 Posts

    Should be reading about 7.5% slow with the 33's, if I used the calculator right.
  9. ct9a

    ct9a Epic Member 5+ Years 1000 Posts

  10. zippy

    zippy Rockstar 100 Posts

    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.

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