We proposed an energy harvester to drive a wireless signal transmitting system for TPMS(Tire Pressure Monitoring Systems). We mounted a piezoelectric generator on the side of a tire to gain energy from the deformation of the tire. The generated energy was stored in a condenser. When the condenser's storage amounted 80 mJ that is enough to drive the wireless transmitter for 1 second, the system served energy to the transmitter. When we rotated the tire 360 degrees, 10 μJ was stored in the condencer. If we put 125 piezoelectric generators at the whole side of the tire and rotate the tire for 64 times, 80 mJ can be gained and the transmitter can be driven.