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430 Searching for correct tire sizes

Discussion in '360/430' started by RossoF430, Apr 21, 2023.

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  1. RossoF430

    RossoF430 Karting

    Jun 6, 2022
    142
    Full Name:
    Clint
    #1 RossoF430, Apr 21, 2023
    Looking for a resource, websites, or suggestions from group members on appropriate tire sizes for 20x8 and 20x12 wheels. Thanks.
     
  2. kenneyd

    kenneyd Formula 3

    Sep 30, 2014
    2,004
    NE FL
    Full Name:
    Ken
    #2 kenneyd, Apr 21, 2023
    The stock ratio is 6.9% difference in diameter from front to rear. (824/771 revs per mile)
    Go to tirerack.com look up the specs of your tires, pick a front and a rear that is close to 6.9% as you can get.
     
  3. RossoF430

    RossoF430 Karting

    Jun 6, 2022
    142
    Full Name:
    Clint
    #3 RossoF430, Apr 21, 2023
    Is there a site to properly size the tires related to wheel size? For example, 20x8 - 245/35/20; 255/35/20 etc.
     
  4. kenneyd

    kenneyd Formula 3

    Sep 30, 2014
    2,004
    NE FL
    Full Name:
    Ken
    #4 kenneyd, Apr 21, 2023
    Tire rack.
    Image Unavailable, Please Login


    I guess the problem with your question is it depends. You're offsets are going to greatly affect your tire choice as well. For example if you're running 11s in the back, you can run an very aggressive offset with 285s, or more conservative offset with 325. Really it depends on what look you're going for.
    So there's really too many what ifs that you'll have to calculate.

    But I will say in general an 8-in rim you're looking for a 225 to 235 to be ideal, and a 12-in rim you're looking for a 305 to 325 ideally.
     
  5. energy88

    energy88 Three Time F1 World Champ
    Silver Subscribed

    Jan 21, 2012
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    #5 energy88, Apr 21, 2023
  6. RossoF430

    RossoF430 Karting

    Jun 6, 2022
    142
    Full Name:
    Clint
    #6 RossoF430, May 13, 2023
    I have found the right tire size combination that will give me as close to 6.9% ratio as possible. My wheel sizes are 20x8.5 (I mistakenly put 8 on the first post) and 20x12. The tire sizes I found are 245/35/20 and 315/35/20 Michelin Pilot Sport 4S (777/726) and the ratio is 7%. Thank you everyone for your help and suggestions.
     
    kenneyd likes this.
  7. kenneyd

    kenneyd Formula 3

    Sep 30, 2014
    2,004
    NE FL
    Full Name:
    Ken
    #7 kenneyd, May 13, 2023
    Sweet, post pictures when you get them installed!
     

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