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.
This is a Pre Built robot that utilizes 4 omni omni-wheels to vector it in any direction. By changing the speeds and directions of the motors the robot can drive in any direction without needing to turn. Customized version of TP-090-004.