Marathon 9x3.50-4" Flat Free Tire on Wheel, 4" Centered Hub, 3/4" Bushings 9x3.50-4" Tire. 9.3" Tire Diameter. 3.3" Tire Width. Flat Free Tire made of solid, polyurethane foam. Non-marking. Smooth Tread. 4" Centered Hub. 3/4" Bushings Designed for zero-turn lawnmowers and other equipment. 300 lb load capacity. Not for highway use.