A two-port tire valve stem has a body, preferably of substantially rigid construction, with a first end portion adapted to be mounted to a wheel rim and a second end portion with at least two ports in a branched configuration, each supporting a valve. One of the valve ports may be used for inflation or deflation concurrently with the other being coupled to a pressure sensor for monitoring the air pressure in the tire. The two-port tire valve stem is adapted to be rigidly mounted to an outer of a pair of adjacent wheels, using a bracket, while its first end is adapted to be connected in fluid communication with the inner of the pair of wheels.