An assembly of a non-pneumatic tire and a wheel comprising: a wheel including: a first side having a first flange, a second side having a second flange, and a circumferential concave surface extending between the first side and the second side; and a non-pneumatic tire including: a radially upper annular band, a radially lower annular band having a circumferential convex surface, wherein the circumferential convex surface of the non-pneumatic tire is received by the circumferential concave surface of the wheel, and wherein the radially lower annular band has an axial width greater than an axial width of the circumferential concave surface of the wheel when the non-pneumatic tire is in an unmounted condition, and tire structure connecting the radially upper annular band to the radially lower annular band, wherein at least a portion of the tire structure has an axial width less than the axial width of the radially lower annular band; characterized in that the circumferential concave surface extends such that a cross-section of the wheel taken along an axial plane is concave radially upwards, wherein the circumferential concave surface is defined by an arc having a first radius; and the circumferential convex surface is arranged such that a cross-section of the non-pneumatic tire taken along an axial plane is concave radially downward, wherein the circumferential convex surface is defined by an arc having a second radius greater than the first radius when the non-pneumatic tire is in an unmounted condition. a wheel including: a first side having a first flange, a second side having a second flange, and a circumferential concave surface extending between the first side and the second side; and a first side having a first flange, a second side having a second flange, and a circumferential concave surface extending between the first side and the second side; and a non-pneumatic tire including: a radially upper annular band, a radially lower annular band having a circumferential convex surface, wherein the circumferential convex surface of the non-pneumatic tire is received by the circumferential concave surface of the wheel, and wherein the radially lower annular band has an axial width greater than an axial width of the circumferential concave surface of the wheel when the non-pneumatic tire is in an unmounted condition, and tire structure connecting the radially upper annular band to the radially lower annular band, wherein at least a portion of the tire structure has an axial width less than the axial width of the radially lower annular band; characterized in that the circumferential concave surface extends such that a cross-section of the wheel taken along an axial plane is concave radially upwards, wherein the circumferential concave surface is defined by an arc having a first radius; and the circumferential convex surface is arranged such that a cross-section of the non-pneumatic tire taken along an axial plane is concave radially downward, wherein the circumferential convex surface is defined by an arc having a second radius greater than the first radius when the non-pneumatic tire is in an unmounted condition. a radially upper annular band, a radially lower annular band having a circumferential convex surface, wherein the circumferential convex surface of the non-pneumatic tire is received by the circumferential concave surface of the wheel, and wherein the radially lower annular band has an axial width greater than an axial width of the circumferential concave surface of the wheel when the non-pneumatic tire is in an unmounted condition, and wherein the circumferential convex surface of the non-pneumatic tire is received by the circumferential concave surface of the wheel, and wherein the radially lower annular band has an axial width greater than an axial width of the circumferential concave surface of the wheel when the non-pneumatic tire is in an unmounted condition, and tire structure connecting the radially upper annular band to the radially lower annular band, wherein at least a portion of the tire structure has an axial width less than the axial width of the radially lower annular band; characterized in that the circumferential concave surface extends such that a cross-section of the wheel taken along an axial plane is concave radially upwards, wherein the circumferential concave surface is defined by an arc having a first radius; and the circumferential convex surface is arranged such that a cross-section of the non-pneumatic tire taken along an axial plane is concave radially downward, wherein the circumferential convex surface is defined by an arc having a second radius greater than the first radius when the non-pneumatic tire is in an unmounted condition.