Pneumatic tire

A pneumatic tire comprising:

• a tread portion extending in a tire circumferential direction and having an annular shape, a pair of sidewall portions disposed on both sides of the tread portion, and a pair of bead portions disposed on an inner side in a tire radial direction of the sidewall portions, a sealant layer containing an adhesive sealant being provided at least on an inner surface of the tread portion and an auxiliary sheet only partially covering a surface of the sealant layer,
• when a thickness of the sealant layer at 0° C. is G0, a thickness of the sealant layer at 50° C. is G50, a width of the sealant layer at 0° C. is W0, and a width of the sealant layer at 50° C. is W50, a rate of change RG of thickness expressed by Equation (1) being 3% or less, and a rate of change RW of width expressed by Equation (2) being 3% or less:
• RG=(|G50−G0|/G0)×100 (1)
• RW=(|W50−W0|/W0)×100 (2);
• wherein
• the auxiliary sheet and the adhesive sealant collectively forming an innermost surface on a tire cavity side of the pneumatic tire at all points along a width and a circumference of the tire where the adhesive sealant is provided,
• the adhesive sealant contains a crosslinking agent, an organic peroxide and a crosslinking aid, and the crosslinking agent contains a sulfur component,
• a mass ratio A/B of a blended amount A of the crosslinking agent to a blended amount B of the organic peroxide is in a range of 2.5/1 to 5/1, and
• a blended amount of the crosslinking aid is from 0.1 parts by mass to 0.9 parts by mass per 100 parts by mass of a rubber component included in the adhesive sealant.