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How to find the circumference of a race car tyre?

One last question for Y/A from me. 

I'm trying to learn how to calculate race car speeds from vehicle specifications. 

Vehicle speed = wheel speed x wheel circumference.

 πD = Wheel circumference

Unlike standard road car tyres, race car tyres provide an overall diameter instead of an aspect ratio.  

Front tyre size: 305/605/18 (mm/mm/in) (Tread width/Overall diameter/Rim diameter)

Rear tyre size: 335/710/18 (mm/mm/in)  (Tread width/Overall diameter/Rim diameter)

Is it just as simple as 'π x overall diameter' to find the circumference here? 

TIA, and good luck in the future all!

1 Answer

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  • ?
    Lv 6
    1 week ago

    Two Pi R, area is Pi R Squared. 3.14516 is usually accepted as Pi.

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