Abstract: An apparatus that mounts on an outer surface of a rim of a vehicle wheel on which a tire can be mounted. The apparatus includes a high pressure reservoir for receiving and storing compressed air from an outside source, a first mechanical valve that permits compressed air from an outside source to be directed into and stored in the high pressure reservoir, a second mechanical valve that directs air from the high pressure reservoir into the extended tire air chamber of a tire, a third mechanical valve that releases air from the extended tire air chamber of the tire, a fourth mechanical valve that releases air from the high pressure reservoir, and a fitting that provides a pressure tight conduit from the tire's air chamber to the extended tire air chamber of the apparatus.