Abstract: A modified air valve construction is provided for use in combination with a modern bicycle wheel having a rim for mounting a tire and an inner tube within the tire. Since many modern rims include relatively deep radiallyinwardly extending fairings which encompass air valves of conventional length, in accordance with the invention, an air valve adapter is received through an inwardly facing hole in the rim and attaches to the original valve stem. The adapter can be operated to selectively open or lock the unmodified valve. A nozzle from a pump can, in turn, be connected to the adapter to inflate the inner tube.