If you wish to drive this wheel with a sprocket, then the sprocket needs to be attached to the side of the wheel, and one ball bearing needs to be pressed into the wheel (on one side). For 1/2 in. id, use two am-0029 bearings and two am-0030 bearings. For 3/8 in. id use four am-0209 bearings.
With Bearings:
One ball bearing needs to be pressed into the wheel (on each side, totaling 4). For 1/2 in. id, use two am-0029 bearings and two am-0030 bearings. For 3/8 in. id use four am-0209 bearings.
Made in the USA: Bearings and screws were not made in the USA. All other components were designed, manufactured and assembled in the United States of America.
Bolt Pattern: 6 hole on a 1.875 in. diameter bolt circle