Marathon Universal Fit Pneumatic (Air-Filled) 14.5-inch Tire and Wheel Assembly, Replacement for 4.80/4-8; 4-8; 4.80-8; 4-6; 3.50-8, Wheelbarrow/Cart Use, Castle Tread in the Wheels & Tires department at Lowes.com
Gorilla 16 in. Turf Universal Wheelbarrow Tire GTT-16WB - The Home Depot
Amazon.com: 2-Pack 14.5-Inch Wheelbarrow Tire.3.50-8" Pneumatic Tires and wheels with 3"- 7" Center Hub and 5/8" Bushings for Wheelbarrow Lawn Mover Replacement. : Patio, Lawn & Garden
Amazon.com: 13" Flat Free Solid Tire and Wheel for Carts Replacement Wheels, Wheelbarrow,Garden Cart,Trolleys,Hand Trucks and Yard Trailers(5/8" Bearings,Offset Hub 2.1") (2-Pack) : Patio, Lawn & Garden