Marathon Flat Free 4.80/4-8 Tire and Wheel Assembly, Contractor Grade, Wheelbarrow Use, Knobby Tread in the Wheels & Tires department at Lowes.com
Amazon.com: Universal Fit, Flat Free Wheelbarrow Tire and Wheel Assembly with Adapter Kit : Patio, Lawn & Garden
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
Marathon 14.5 in. Flat Free Universal Wheelbarrow Wheel 00270 - The Home Depot