KEY PARAMETERS: Tire and Wheel Model: 4.80/4.00-8; Tire Diameter 16"; Tire Width: 3.6"; Axle Bore Hole Diameter: 5/8"; Centered Hub Length: 3"; Dynamic Load Capacity: 300 LBS UNIVERSAL FIT: These solid tires are one of the most commonly used sizes on wheelbarrows and trolleys. Please check carefully before ordering to make sure it matches your previously used tire PUNCTURE-PROOF & INFLATE-FREE: The solid air-less tire is made of premium PU (polyurethane) foam with no inner tube, which has the features of high strength, good wear-resistance, and tear-resistance. So that you do not have to worry about the problem of tires being punctured ONE-PIECE WELDED RIM: These wheelbarrow wheels are equipped with DOUBLE-SEALED CARBON STEEL BEARINGS to provide flexible rotation and load balancing. And high-strength ONE-PIECE WELDED RIM to make sure it does not bend or fall apart with the hub when loading large capacity 2 PACK TIRES WITH EXTRA ADAPTER KIT: Comes with four 3/4-inch bearings and four 0.5-inch and 1.5-inch nylon spacers that can be adjusted for different wheel hub lengths and bearing holes 4.80/4.00-8" Flat-free 16-inch Solid Tire and Wheel with 5/8" Axle Bore Hole, 3 " Centered Hub for Wheelbarrow Garden Wagon Broadcast Spreader Trolley Dolly Lawn Mover Replacement