Provided is a tire capable of effectively suppressing a failure due to tire flexing and a failure due to friction between the tire and a
flange of a rim, thereby improving durability. In a tire (10) having a cross-sectional height SH in the range of 50 mm to 150 mm, in a no-load state in which the tire (10) is fitted to a prescribed rim and filled with a prescribed
internal pressure, when an opening distance between the tire (10) and the
flange (22) of the rim on a vertical line drawn from a radially outermost point Tr of the
flange (22) to an outer surface of the tire (10) is set as A, the opening distance A satisfies a relationship of 0.01 ≤ A / SH ≤ 0.16 with respect to the cross-sectional height SH, and when a projection amount equivalent to 1 / 2 of a difference between a total width TW of the tire (10) and a rim width DW of the prescribed rim (21) is set as W, the opening distance A satisfies a relationship of 0.03 ≤ A / W ≤ 1.60 with respect to the projection amount W.