There were others. Remember they had Hex axles when they first came out. Then they had 12 screw rims till 1940. Then they went to the 6-bolt solids, then 3 bolt solids, then the cutouts.What does anyone know about L hubs? I thought that there were 2 types, solid and spoked, but now I see the solid has 3 and 6 bolt types, are there more? Anyone know dates?