Marathon 4.80/4.00-8" Flat Free Wheelbarrow Tire on Wheel, 6" Centered Hub, 5/8" Ball Bearings, Ribbed Tread 4.80/4.00-8" (15.5" diameter) with a 6" centered hub and 5/8" ball bearings. This tire and wheel assembly is commonly used on contractor-grade wheelbarrows, garden trailers, roofing equipment, spreaders, and more. Comes pre-mounted on a solid steel, white wheel for quick and easy installation. Has the same feel and handling of an air-filled tire, but guaranteed to never go flat. Features a contractor-grade load capacity of 500 pounds and a ribbed tread for easy maneuvering.