Belt is 5 inches diameter. Largest gear is thermoplastic 1-1/4" diameter with 30 teeth and 3/8" center hole. Next size is a dual gear/pulley thermoplastic 7/8" diameter with 20 teeth and 3/4" diameter with 24 teeth and 1/4" center hole. Next is a metal gear 5/8" diameter with 18 teeth and 1/4" center hole with set screw.
