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increased ground clearance

Discussion in 'Wheels & Tires' started by chihawks35, Mar 26, 2013.

  1. chihawks35

    chihawks35 New Member

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    If im upgrading from a 31" tire on a 17" wheel to a 33.5" tire on an 18" wheel about how much more ground clearance do you think i will get. i mean basic math would say about 2 inches but how true is that?
    #1
  2. SurrealOne

    SurrealOne Former Member

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    Since you only provided overall diameter of the wheel and the tire (i.e. didn't provide tire width and profile information), I can't calculate what you're asking about, as there's not enough information. So, instead, I'll link you to the calculator I'd use and you can calc it, yourself, and answer your own question.

    http://www.miata.net/garage/tirecalc.html

    Best I can do given the info provided. :)
    #2
  3. chihawks35

    chihawks35 New Member

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    this doesnt seem to give me any ground clearance information it just shows my spedo difference im going from 265/70/17 to 275/70/18
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  4. SurrealOne

    SurrealOne Former Member

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    Try paying attention to the 'diameter' information for the old and new tire sizes. The delta between the two is the clearance you'll get. ..after considering/accounting for both wheel and tire information, which is what you were looking to do.
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  5. chihawks35

    chihawks35 New Member

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    i see what you're saying thanks
    #5
  6. barefoot greg

    barefoot greg New Member

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    goin from a 31 to a 33.5 should give you about an 1.25 inch gain in clearance. the center of both tires will mount to the hub in the same spot. so of the 2.5 inches of difference in size, half will be on top, and half will be on the bottom( which is what is going to add clearance)
    #6
  7. TimTom64b

    TimTom64b New Member

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    The real benefit of the larger tires are that it will fill the wheel wheels better and just give more balance to the look of your vehicle. 33.5's are what I am running on mine...:)))
    #7
  8. chihawks35

    chihawks35 New Member

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    yea your truck is nice i think it will look good. thanks for the help

    ps, i like that custom encore you have looks good, i have an omega

    - - - Updated - - -

    yeah i think the ones im looking at (nittos) are like 33.64 inches so that should look nice
    #8
  9. RayVoy

    RayVoy Active Member

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    Yep :great: it's actually the radius of the tires you need to use. The 31 has a radius of 15.5", the 33.5 has a radius of 16.75". The difference, as calculated by @barefoot greg, is 1.25"
    This would be the effective increase in clearance.
    #9
  10. chihawks35

    chihawks35 New Member

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    yea it should pick me up a little bit thanks
    #10
  11. SurrealOne

    SurrealOne Former Member

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    Oops, I forgot to take the delta and half it. :no:

    Duh! One of those days. Thanks for catching my goof! :great:
    #11
  12. aloxdaddy99

    aloxdaddy99 New Member

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    What truck do you have? And lift? I ask because I have a level kit with 33's and they rub. My tires are 12.50's. So that may be something to think about when making this choice. It was something that was easily fixed with a grease pencil and a dremil tool.
    #12

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