Size is 10.5-inch x 4-inch.
5" Flat-Free Wheel for Gas Cylinder Hand Trucks, Steel, 35378 Urethane filled wheels will not go flat to ensure mobility of hand trucks on almost any terrain.5" Flat-Free Wheel for Gas Cylinder Hand Trucks, Steel, 35378 For hand truck models 35008, 35012, and 35030.625-inch axle (not included)..