What will 3.73s do for my '01?

Discussion in 'SVT Tech Forum' started by Ganton, May 4, 2004.


  1. SVTRacer01

    SVTRacer01 New Member

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    A 245/40/17 tire does have the same diameter as a 315/40/17 tire, but only on the inside of the tire where it mounts to the wheel (rim diameter). The outside diameter of the two tires will be different though. The first three numbers of the tire (ie. 245, 315, etc.) are the overall width of the tire, while the second two numbers (ie. 40 series) are the aspect ratio of the sidewall height to tire width. Check out the specs @

    http://www.tirerack.com/tires/tiretech/general/size.jsp

    So, a 245/40/17 tire is 24.72" in diameter and a 315/40/17 tire is 26.92" in diameter. Over 2" in size.
     
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  2. RDvenom99

    RDvenom99 Founding Member

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    Got it, thanks for clearing that up!
     
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  3. RDvenom99

    RDvenom99 Founding Member

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    If anyone is looking for a really nice gear calculator try this one I found:

    Gear Calculator
    It requires MS Excel but is very nice
     
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  4. king

    king New Member

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    Had 4:10 in my 98 cobra then went 3:73, waste of time and money! Go 4:10 or 4:30 ,you will be pleased! :nice:
     
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  5. markt1968

    markt1968 New Member

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    One thing that nobody has taken into consideration is if you autocross or open track your car. 4.10's are great for the street but too tall for road racing, especially on some of the longer tracks. 3.73's would be better for these two situations.
     
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