Diameter. A high school discus ring has a diameter of 2.5 m, which translates to 8 feet and 2.5 inches. This is larger than a shot-put ring, which is 7 feet in diameter.Click to see full answer. Hereof, what is the radius of a discus ring? The size of a discus ring The diameter of a discus ring is 2.5 meters, or 8 feet 2 1/2 inches.Similarly, how are discus throws measured? It is to be made from the point where the discus first breaks ground to the inside of the arc of the throwing circle with the tape held through the center of the throwing circle. 2. Measurement is to be to the nearest lesser inch. Similarly one may ask, what are the dimensions of a shot put ring? Competitors take their throw from inside a marked circle 2.135m (7 ft) in diameter, with a stopboard about 10 centimetres (3.9 in) high at the front of the circle.Is discus measured in feet?The discus is thrown from a circle measuring 2.5 meters, or 8.2 feet, in diameter.