the present invention couples a tire pump with the wheel rim of a vehicle . the pump is activated electromagnetically to inflate the tire as desired , e . g . when tire pressure is below a required value . the pump is arranged to draw air from the atmosphere and pump into an interior portion of the tire . a magnetized plunger within the pump is biased to an initial position by a biasing element . energizing an electromagnet generates a magnetic field . the pump is arranged to rotate in and out of the magnetic field to cause the plunger to reciprocate and inflate the tire .