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S70 Tires and Speedo S70

posted by  someone claiming to be A on  Tue Dec 5 09:20 CST 2006 [RELATED]

If I go up to 16 in wheels form 15, how far will it throw the speedo?

What if I stay with 15's and go up from 195 60 to 205 60?








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    S70 Tires and Speedo S70

    posted by  badbuzz on  Sun Dec 24 04:17 CST 2006
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Wed Mar 28 14:06 CST 2007
    [RELATED]

    Here is a link that lets you play with tire size combos and see what impact it would have on the speed reading.

    Merry Christmas!

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

    --
    2004 S60 2.5T AWD : 500 Km's








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    S70 Tires and Speedo S70

    posted by  Deanyel on  Tue Dec 5 10:57 CST 2006
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    last visit: Sun Sep 21 12:02 CST 2008
    [RELATED]

    Changing the wheel size has no impact on the speedo - just changing the diameter of the tire. Tire diameter is equal to width in mm divided by 25.4 (195/25.4 or 7.677) times aspect ratio times 2 (.60 X 2 or 1.2) plus the diameter of the wheel (15) or 24.21 inches for a 195/60/15. A 205/60/15 is then 24.68 inches in diameter or 1.95% greater than the 195/60/15. So you speedometer will be off by 1.95%. Both your speedometer and odometer will be understated by that amount. With the right 16 inch tire size you should be able to come very close to the original diameter.







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