Hi-Run Hi-run Wheelbarrow Tire 4.80/4-8 Flat Free Tire and Wheel in the Wheels & Tires department at Lowes.com
16" Flat-Free Wheelbarrow Tire
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