Jackson Spoked Wheelbarrow Tire 15-1/2 in. Dia. x 6 in. W Butyl Rubber | eBay
Amazon.com: AR-PRO (2-Pack) 4.00-6" Tire and Wheel, 13" Pneumatic Wheelbarrow Tire and Rim, 5/8" Bearings and 1.75" Centered Hub, for Garden Carts and More (Extra 3/4", 1/2" Bearings and 1.5", 1/2" Nylon
Carlisle Wheelbarrow 480/400-8/4 Lawn Garden Tire (Wheel Not Included) 5130511 - The Home Depot
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