L = 156m,
So, the perimeter of the tire = 156/39 = 4m,
So the radius of the tire = 1.13 m,
The diameter of the tire = 2.26m.
So, the perimeter of the tire = 156/39 = 4m,
So the radius of the tire = 1.13 m,
The diameter of the tire = 2.26m.