Wheel Barrow Tire and Wheel, 16 in. x 4.00-8 in., 5/8 Bore Size, Ribbed Tread at Tractor Supply Co.
Jackson True Temper 16" Flat-Free Knobby Replacement Tire and Wheel Assembly - White Cap
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
Wheelbarrow Tires 4.80/4.00-8 with 5/8 Bearing, 3.5-6" Hub Flat Free 16 inch Solid Rubber Tire Replacement Wheelbarrow Wheel 4.80-8 for Wheel Barrel Yard Cart Garden Wagon (Set of 2) - Walmart.com
TRUE TEMPER REPLACEMENT WHEEL ASSEMBLY - Littleton, MA - Great Road Farm & Garden