I found an old iron wheel today. It is about 36-40 inches in diameter, all metal. It has a strip of metal around the outside of the metal rim held on with what seemed to be rivets. It has metal "spokes" that are about 1.5 inches across and 3/4 inch wide. In the "hub" is a place that looks like a sprocket would fit inside, maybe on the axle. The hub is about 6-8 inches in diameter. Any ideas on what this may have been on. We thought maybe on an old tractor before tires with air? This was in sw Missouri on a hilltop deep in the woods. It was broken and probably replaced and discarded right where I found it.