Wheel state adjustment system and method thereof

A pressure detection sensor (30) for detecting a tire internal air pressure and a wheel side communication device (34) for transmitting a detection result of the pressure detection sensor (30) using a preset transmission mode are provided on each wheel (14). The detection result from the pressure detection sensor (30) is transmitted to an ECU (26) via a vehicle body side communication device (34) provided on a vehicle body (12). The ECU (26) is able to notify a transmission mode determination device (32) provided on each wheel (14) that adjustment of the tire internal air pressure is being performed by manipulating a state of the tire internal air pressure. The transmission mode determination device (32) determines a transmission mode to be used by the wheel side communication device (34) such that a transmission frequency of a notification related to the occurrence of an abnormality of the wheel is reduced while adjustment of the tire internal air pressure is being performed.