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.
A compact autonomous robotic platform that's offers the flexibility of a viper in both development and design. Capable of creating it's own path in both known and unknown areas. SLAM and other sensors allow for accurate obstacle avoidance!
SparkFun's minimal design approach to Arduino. This is a 5V Arduino running the 16MHz bootloader.