A Madico flat-free replacement wheel from Richelieu. The tire is molded from microcellular polyurethane foam rather than holding air, so it cannot go flat from a puncture or lose pressure, and it stays usable in extreme cold. Richelieu lists the 13" (4.00-6) size for wheelbarrows and hand trucks.

• Tire size: 4.00-6 (13" nominal; wheel diameter 13")
• Tread: knobby, 80 mm (about 3-1/8") wide
• Hub: offset, metal, with grease fitting - the hand truck version of this size
• Axle: 5/8" diameter x 2" long
• Dynamic load capacity: 309 lb
• Recommended surfaces: asphalt, concrete, steel grating, wood planking, gravel and grass
• Other uses include compressors, log splitters and light trailers
• Not for highway use

Tip: Richelieu lists wheel diameters as nominal, so match the tire size code (4.00-6), the axle diameter and the hub length to your old wheel rather than the outside diameter alone.