This is a robot drive wheel we had made specifically for us. It does not have a bearing. It is 6 inches in diameter and 2 inches wide. It's a solid foam core with rubber treads and outer layer. The steel rim is painted black with a 4 bolt pattern so you can easily mount it to a flanged hub.
Tactical Black GPK-32 Inspection Robot Package. Includes Dewalt Battery Mount, 2 Dewalt Batteries and a charger, 1080p camera with LEDs that can be turned on and off. Ideal for monitoring and observation. Chassis is anodized black.
This is powerful wheelchair motor. They make great heavy-duty robot motors. 250W 120RPM motors with 17mm keyed shaft output. They are sold individually and have an electric brake mounted on the back.