Turning Radius calculation Introduction This article describes the calculation of the turning radius of a car or bicycle. This radius depends on two things: - the wheelbase w , which is the distance between the front- and the rear wheel - the angle a of the front wheel We suppose that only the front wheel is able to turn. See figure below: side view top view Calculation The front and rear wheel follow a circle with the same center. At all times, the direction is perpendicular to the radius. See figure below: movement The radius of the front wheel is R, the rear wheel r. From the figure above we conclude: also