Abstract: This tire state estimation method includes the following. (1) Disposing, on the inner side of a tire, at least one power generator that generates voltage in response to deformation of the tire. (2) Acquiring measurement data in a time series obtained by measuring, while the tire is rotating, the voltage and/or a physical quantity corresponding to the voltage. (3) Identifying a peak that repeatedly appears in the measurement data. (4) Identifying a value of the peak and/or an interval of the peak. (5) Estimating the state of the tire on the basis of the identified value and/or the identified interval. The power generator is provided with a first member and a second member. The first member and the second member are configured such that one is positively charged and the other is negatively charged in accordance with pressure applied to the first member and the second member.

Abstract: A tire assembly includes a tire, a fixing member, and one or a plurality of functional members. The tire includes an attachment-receiving portion on an inside surface of the tire. The fixing member includes a body portion extending along a circumferential direction of the tire, and an attaching portion attachable to and detachable from the attachment-receiving portion. The one or plurality of functional members are configured to be fixed to the fixing member. The body portion includes at least one of metal, synthetic resin, or rubber.

Abstract: A fire assembly can include a tire, a sound absorbing material, and a plurality of functional components. The sound absorbing material can be placed on an inner side of the tire. The plurality of functional components can be placed on the inner side of the tire. The plurality of functional components can be placed such that masses of the plurality of functional components as a whole are distributed along a circumferential direction of the tire.

Abstract: A tire assembly includes a tire for mounting on a vehicle, an elastic body disposed on an inner side of the tire, and a power generation body disposed between an inner surface of the tire and the elastic body. The power generation body includes a first member and a second member. The first member has a first insulating film forming a first surface. The second member has a second insulating film forming a second surface that faces the first surface and contacts the first surface. The elastic body biases the power generation body toward the inner surface of the tire.