This pneumatic wheel with a sawtooth tread is 12 inches in diameter and 3 1/2 inches in width. It has a silver symmetrical metal hub and a load rating of 450 pounds. The wheel has a bore diameter of 1/2-inch and a tire thickness of 3 1/2 inches. It has a ball bearing, a hub length of 4 7/16 inches, and a wheel description of 19-12 x 3.50.