Marathon 4.10/3.50-4" Flat Free, All Purpose Utility Tire on Wheel, 3.5" Centered Hub, 5/8" Bearings 4.10/3.50-4" (10.5" diameter) with a 3.5" centered hub and 5/8" ball bearings. This tire and wheel assembly is commonly used on air compressors, hand trucks (dollies), generators, pressure washers and other utility equipment. Also compatible with rigid or swivel casters. Comes pre-mounted on a solid steel, silver 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 load capacity of 250 pounds and a sawtooth tread for the perfect balance of traction and maneuverability.