Patent ID: 7817023

Claim:
A wheel information acquiring system that is attached to a wheel and acquires wheel information of the wheel during rotation, the wheel information acquiring system comprising: a first communication device that is attached to the wheel and detects wheel information associated with the wheel during rotation, and wirelessly transmits the detected wheel information from a wheel side; and a second communication device that is provided apart from the wheel and that receives and acquires the wheel information transmitted by the first communication device, wherein: the first communication device has a maximum value of rotation speed specified for the wheel during rotation to which the first communication device is attached; and when a transmission time width of one packet of the wheel information transmitted by the first communication device is represented by T 1 , and an expected minimum rotation period which is determined according to the maximum value of the rotation speed prespecified in the first communication device is represented by R 1 , the T 1 is set so as to satisfy T 1 ≦R 1 ·½, and wherein the first communication device transmits, in addition to the wheel information, power supply voltage information of the first communication device.