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.
This prebuilt RTR robot uses our standard ATR chassis and 10 inch tires. We have included everything to make it ready to run including batteries, controllers, chargers, etc. Upgraded drive train with encoders on each motor set to speed control.