Run flat assembly

The present invention provides a run flat assembly for use with a wheel and a pneumatic tire having a tread, two sidewalls and an interior carcass surface. The run flat assembly includes an inner tube having an outer surface bonded to the interior contour of the pneumatic tire; and an inner rim bonded to said inner tube opposite the interior contour. The inner rim abuts a wheel rim when pressure in the pneumatic tire is reduced to a non-operational level