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  1. #1

    Question Over sized tires on stock rims

    So I have the 245/70-17 stock rims and tires at the moment. I don't really have the cash right now to get new wheels too (plus i haven't seen any i really like). So I want to put some larger AT tires on the rims I have but i don't really understand the technical details of tire sizes and what can fit on what.
    Not only do I want them taller, but I want them wider as well. Hence the 275 request below.

    Is it possible to put a 275/xx-17 tire on my 245/70-17 rim?

    Im not really sure how to calulate the XX.
    Last edited by dwill3015; 04-17-2009 at 03:22 PM.

  2. #2


    Do you know how wide your rims are (clean the inside of the wheel and see if it is stamped into the metal somewhere).

    Unless they put really skinny rims on there (stock in those cases I've looked at have been 6.5 or 7 inches), 275 mm wide should fit just fine.

    As far as figuring out the aspect ratio (xx), here's what the numbers mean (put this into your favorite search engine, this information is all over the internet):

    275: nominal tread width in mm (TW)
    75: aspect ratio (AR), basically sidewall height divided by tread width (as a per cent).
    17: rim diameter. (RD)

    So to figure out what aspect ratio you want: determine what overall diameter (OD) you want, then solve the following equation for AR:

    '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

    Default Tire Size

    Go to this site they have it all figured out for you. Just put in the sizes and away ya go.

  4. #4


    Quote Originally Posted by Bluewater View Post
    Go to this site they have it all figured out for you. Just put in the sizes and away ya go.

    Awsome site. Thanks!

    I ended up deciding on some 18" rims anyways.

  5. #5

    Default site

    They sure make it easy..

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