A tire assembly comprising: a tire including a pair of bead portions and an electronic device that is mounted onto an inner surface of the tire ; and a rim assembled to the tire , wherein the bead portions are provided with a rim contact surfaces being in contact with the rim , and in a cross section of the tire orthogonal to a tire circumferential direction and running along a tread width direction (twd), an outer end portion of the electronic device in a tire radial direction (trd) is located on an inner side in the tire radial direction (trd) of a reference position (P1) that is located on an outer side in the tire radial direction (trd) of an outer rim end portion , which is located on an outer side in the tire radial direction (trd) of the rim contact surface , by a thickness (T1) of the bead portion in the outer rim end portion , characterised in that : the rim includes a rim base that supports an innermost surface of the bead portion in the tire radial direction (trd), a rim flange that supports an outer surface of the bead portion , and a bead seat band that fixes the rim flange to the rim base , and an inner end portion of the electronic device in the tire radial direction (trd) is located on an outer side in the tire radial direction (trd) of an outer end portion of the bead seat band in the tire radial direction (trd) when mounting the rim . a tire including a pair of bead portions and an electronic device that is mounted onto an inner surface of the tire ; and a rim assembled to the tire , wherein the bead portions are provided with a rim contact surfaces being in contact with the rim , and in a cross section of the tire orthogonal to a tire circumferential direction and running along a tread width direction (twd), an outer end portion of the electronic device in a tire radial direction (trd) is located on an inner side in the tire radial direction (trd) of a reference position (P1) that is located on an outer side in the tire radial direction (trd) of an outer rim end portion , which is located on an outer side in the tire radial direction (trd) of the rim contact surface , by a thickness (T1) of the bead portion in the outer rim end portion , characterised in that : the rim includes a rim base that supports an innermost surface of the bead portion in the tire radial direction (trd), a rim flange that supports an outer surface of the bead portion , and a bead seat band that fixes the rim flange to the rim base , and an inner end portion of the electronic device in the tire radial direction (trd) is located on an outer side in the tire radial direction (trd) of an outer end portion of the bead seat band in the tire radial direction (trd) when mounting the rim . the rim includes a rim base that supports an innermost surface of the bead portion in the tire radial direction (trd), a rim flange that supports an outer surface of the bead portion , and a bead seat band that fixes the rim flange to the rim base , and an inner end portion of the electronic device in the tire radial direction (trd) is located on an outer side in the tire radial direction (trd) of an outer end portion of the bead seat band in the tire radial direction (trd) when mounting the rim . <EOS>