Marathon 4.80/4.00-8" Flat Free Tire on Wheel, 3" Hub, 5/8" Bearings, Ribbed Tread 4.80/4.00-8" Tire. 15.5" Tire Diameter. Flat Free Tire made of solid polyurethane foam Non-marking Ribbed Tread 3" Centered Hub 5/8" Ball Bearings Perfect for Contractor Wheelbarrows Most Common for 6 Cubic Foot Wheelbarrow 500 lb. load capacity Not for highway use