Tire Assembly and Tire Deformation State Determination System

A tire assembly includes a tire and a shape measurement unit utilizing magnetism. The shape measurement unit is provided with one device of a magnetic generator or a magnetic sensor configured to detect a distance of separation from the magnetic generator based on a magnetic field generated by the magnetic generator to acquire a deformation state of a sidewall, in a first region that is any one of a tread-portion-corresponding region and bead-portion-corresponding regions that are on an inner surface of the tire, the tread-portion-corresponding region corresponding to a tread portion and the bead-portion-corresponding regions corresponding to bead portions, and is provided with another of the magnetic generator or the magnetic sensor in a second region.