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  1. #21
    Lifetime Member Getting Dirty Matt's Avatar
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    Depends on the wheel width... but +18 is probably your best bet if you're in the 8-9" wide range?

  2. #22
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    yeah they are 9". what about 33x12.50x18
    2007 Jeep Commander Overland///5.7L V-8 hemi////Quadra-drive II////Cobra Cb with PA system////K&N cold air intake////Superchip Flashpaq////Navigation system////Boston acoustics Future mods: 4" superlift///All terrain tires///HD UCAs///HD LCAs///OME front coils///Rancho rear coils///Defender roof rack///light cage///Steel bumpers///Rear differential guard///Rocky Road supersliders///tail li

  3. #23
    Lifetime Member Getting Dirty Matt's Avatar
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    ..... stick with a 285/65/18

  4. #24
    Lifetime Member Getting Dirty XK N00b's Avatar
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    Quote Originally Posted by Matt_ View Post
    ..... stick with a 285/65/18
    Could you define what this means? I'm not sure that the 285/65 is. Is it tread width/sidewall height in mms? ?/?/Rim Diameter
    2008 Overland in Black
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    All 3 MOPAR Skids, VEC, Tow Pkg., 2" Rough Country Lift, 1 1/4" Spidertrax spacers, 255/75/17 BFG M/T's, Flowmaster 50 series muffler

  5. #25
    Lifetime Member Getting Dirty Matt's Avatar
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    285 = width (basically the tire width) in millimeters. 285 millimeters wide.
    65 = sidewall height as a percentage of the width. So 65% in this case. 65% of 285mm = 185mm.
    18 = wheel diameter.

    You can figure out the overall tire diameter by just adding the wheel diameter and 2 times the sidewall (So 18" + 185x2mm = 32.56").

    A QUICK way to determine tire diameter is this:
    (First Number) x (Second Number) / 1270 + (Third Number)
    So: 285 x 65 / 1270 + 18 = 32.58"

    To determine tire width, just convert mm to inches by dividing by 25.4:
    285/25.4 = 11.22

    QED:
    285/65/18 = 32.5x11.2x18

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