This is a single axle with a hub that mounts to our 6 inch tires. The end opposite the hub is bored to fit an 6mm shaft. It is intended to be direct driven by our IG32 motors. The hub is welded to a steel 1/2" diameter shaft.
This is a robot drive wheel we had made specifically for us. It does not have a bearing. It's 10 inches in diameter. 3" inches wide. Its Pneumatic with a 4 bolt pattern so you can easily mount it to a flanged hub.