This is a robot drive wheel we had made specifically for us. It does not have a bearing. Its 6 inches in diameter. 1.9" inches wide. Its a rubber pneumatic tube tire. The rim has a 4 bolt pattern so you can easily mount it to a flanged hub.
A ready to ship prebuilt All-Terrain 4WD robot. It features 10" pneumatic tires and IG42 078RPM Gear motors. Controller, battery, and charger included. Also included is a cover with 80/20 1" extruded aluminum rails.