This 13 in. flat-free wheelbarrow tire is constructed from solid foam, ensuring durability and eliminating the risk of flats. It comes with a 3 in. hub and includes additional plastic spacers, allowing the hub length to be extended up to 6 in. to fit various wheelbarrow models. The tire is equipped with a 3/4 in. ball bearing and also includes two 5/8 in. replacement ball bearings to accommodate different axle sizes. With a maximum weight capacity of 300 lbs. this tire is suitable for backyard wheelbarrows (mostly 6 cu. ft.), trailer dollies, riding lawn mower carts, dump carts, pressure washers, yard wagons, generators, snowblowers, and more. Its ribbed tread pattern provides excellent traction across various terrains. Specifications: Tire Type: Flat-Free Tire Size: 4.00-6. Material: Solid Foam Overall Diameter: 13 in. Bearing Size: 3/4 in. (includes two 5/8 in. replacement bearings) Hub Length: 3 in. (extendable to 6 in. with included spacers) Tread. Pattern: Ribbed Section Width: 4 in. Rim Size: 6 in. Maximum Weight Capacity: 300 lbs. Material: Polyurethane.