mark the tyre sidewall with chalk at bdc
mark the road at the same point
roll the tyre ten times
mark the road
measure and divide by ten
gives a good average for the circumference
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The tire's radius is 23.9 inches.
Diameter = Circumference/pi
Circumference = π * Diameter
If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)
Divide the circumference by PI (3,14159...)