Tyre size v Rim size | FerrariChat

Tyre size v Rim size

Discussion in 'Technical Q&A' started by jkuk, Apr 5, 2004.

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  1. jkuk

    jkuk Formula Junior

    Nov 3, 2003
    Wirral, UK
    Full Name:
    John K
    Guys I have tried the search facility without joy as I know there are lots of threads concerning wheel/tyres.

    Does anyone know the rules concerning rim size versus max tyre size.

    For instance,

    How wide can you safely go with a 7.5J rim or an 8J rim etc.

    Is there a standard calculation that can be used.

  2. Schatten

    Schatten F1 World Champ

    Apr 3, 2001
    Austin, TX
    Full Name:
    yes and no. But the "j" doesn't matter. It's just the 7", 7.5", 8" width of the wheel itself.

    some links to help out:

    great calculator (but for Miata's primarily) here:

    but keep in mind, the most important aspect of buying different tires, even if they are the same sizes, brands/models will differ. For example, for my car, an [Honda] OEM Potenza S02 in 225/50/16 will be much wider than a Pole Position Potenza S02 (which is discontinued btw) of the same size. An OEM tire can be shaped differently and treaded differently.

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