Marathon Universal Wheelbarrow Tire with Flat Free Tire Sealant. Flat Free Tire Sealant is designed to quickly fill holes in the tire tread. Wheelbarrow Wheel for tire sizes 4.80/4.00-8, 4.00-6, 4.00-8 and 3.50/2.50-8. Comes with 3 In. Hub 5/8 In. Ball Bearings. Includes 3/4 In. Ball Bearings with spacers to make 4 In. to 6 In. Hub Length. Fits most wheelbarrows with 13 In. to 16 In. Tires. Fits most wheelbarrow brands including most True Temper, Jackson, Truper, Scenic Road, Marathon, Kobalt, Craftsman, Yard Rover, GroundWorks, Anvil and Project Source wheelbarrows.