When selecting a discus, consider the flight characteristics (amount of wobble, attitude and angle of release) and the athlete’s ability to create rotary velocity (spin).
LOW SPIN — Center balanced (70% or less of the weight in the rim), low spin discus are more controllable for the beginner or intermediate level athlete who does not yet have a high rotary velocity at release. Center balancing results in less wobble for a more aerodynamically sound flight.
HIGH SPIN — Rim balanced (71% or more weight in the rim), high spin discus are for advanced and elite throwers who can generate a high rotary velocity at release. As the thrower’s technique improves, a higher percentage of rim weight can then be effective.
Women, H.S. thru age 74: 1 kg. Women 75+: 0.75 kg. H.S. Boys: 1.6 kg.; Int'l Jr. Men 19 & under: 1.75 kg. Men to age 49: 2 kg.; 50-59: 1.5 kg.; 60+: 1 kg.