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Thread: Rim Width - Tire Width Equivalency Chart

  1. #21
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    Quote Originally Posted by Richard EVO View Post
    "No man ever lost money underestimating the intelligence of the American people." P.T. Barnum

    Richard, you incorrigible misanthrope, the sun is shining and birds are chirping. Children laugh and play. For a better view on the matter:

    "You know everybody is ignorant, only on different subjects". Will Rogers
    Last edited by Loose Caboose; 09-18-2013 at 06:43 PM.

  2. #22
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    Quote Originally Posted by Loose Caboose View Post
    Richard, you incorrigible misanthrope,
    I believe that this is a gross misrepresentation and should read:

    Incorrigible misanthropic curmudgeon

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    Quote Originally Posted by emilio700 View Post
    A few things to keep in mind when making generic statements on tire and wheel sizing.

    Manufacturers are not held tightly to standards regarding sizing. One manufacturers 255/40/17 might be 10mm narrower tread but 10mm wider casing than another brand. Even within the same brand, two different models of tire in the same size
    might have different dimensions. Recommend rim widths as published by manufacturers are written by lawyers.

    The general rule still applies for those concerned with maximum grip from a high performance radial tire: Choose a wheel at least as wide as the actual tread.

    Case in point: The Hoosier 205/50/15 tires we race on have a 215mm wide tread and 240mm wide casing. What rim have we found them to be the fastest on? 228.6mm (9")
    Our 205 Toyo, Nitto and Maxxis tires are between 197-203mm tread. We run those on a 203.2mm wheel (8")
    This is not conjecture but back to back A/B testing, empirical knowledge.

    The lesson here is if you are looking for max grip, go measure the tread on the actual brand/model/size tire your are considering. Choose a wheel width that matches that tread width. Still doubts?
    Measure the tread and wheel widths on some high performance cars like the GT-R, Z06, 911, 458, etc. You'll find actual treads and wheel widths matched up.
    How exactly do you define the tread width? Are you measuring from where the sidewall rubber stops and the tread rubber starts to the same place on the opposite end, or are you measuring only the scrubbed rubber on the tread that actually comes in contact with the road surface?

    For example my 245/40/17 RE-11 has a casing width of ~241mm, the tread rubber measures ~237mm but only 224mm of that actually touches the ground. Should I be basing wheel width off of 237mm or 224mm? Would a 9.5" wide wheel be faster?

    You say choose a wheel width that is "at least as wide as the actual tread width", but roughly how much wider wheel width can you go before you reach the point of diminishing return, assuming you are using an EHP street tire? Say you had a tire that had a 235mm (9.25") tread width, would you say that tire is fastest on a 9.5" or 10" wide wheel? What if 9" or 10" were the only options- would you choose the 10"?

    It is also my understanding that for a given tire width, as wheel width increases your hot pressures should decrease, correct?

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