Tire condition monitoring apparatus

A tire condition monitoring apparatus for use in a vehicle. The apparatus includes an initiator (60) arranged on a nonmetallic mudguard (12) of the vehicle. The initiator transmits a trigger signal. A transmitter (30) is arranged in the tire (20) and includes a sensor (32) for detecting the condition of the tire. A trigger signal detection circuit (35) receives the trigger signal. A transmission circuit (33) transmits information related with the tire condition when the detection circuit receives the trigger signal. A receiver (40) is arranged on a body frame of the vehicle. The receiver includes a reception circuit (45) for receiving the information from the transmitter (30) and a controller (44) for controlling the transmission of the trigger signal from the initiator.