Economy Wheel has 10 spokes, is 1" wide, has a 4" diameter hub that is 2.3/4" wide, with a 1/2" bore. Hub is made of cast Aluminum. It is recommended to use a brass bushing on the axle opening (hub is made of cast aluminum) for light duty. These wheels do not have weight specifications. The Wheel is made well. Please be sure of your selections, the wheels are not returnable. The wheels are timely to pack and costly to send if the larger sizes are selected.