Marathon 4.80/4.00-8" Flat Free Tire on Wheel, 3" Hub, 3/4" 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. 3/4" Ball Bearings. Perfect for Contractor Wheelbarrows. Most Common for 6 Cubic Foot Wheelbarrow. 500 lb load capacity. Not for highway use.