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 complete inspection robot package includes Dewalt Battery Mount, 2 Dewalt Batteries and a charger, RunCam2 camera and high power LED lights. It records in HD 1080p. Designed for inspecting hard to reach areas such as crawlspaces and attics.