Designed to fit the majority of hand trucks, generators, pressure washers, garden carts, and other small equipment. Tire is made out of solid, polyurethane foam. It provides the bounce and cushion of an air filled tire with the benefit of never going flat. Tire size is 4.10/3.50 to 4". Tire DIA is 10.5". Tire Width is 3.3". Tire comes mounted on a steel rim with a 2.25" offset hub and 5/8" ball bearings. The included parts kit contains a variety of spacers and 3/4" bearings to meet various hub and axle configurations to help adapt it to the equipment. Tire load capacity is 300 lb (pound).