Pneumatic tire

A pneumatic tire comprising:

• a tread portion;
• a pair of sidewall portions;
• a pair of bead portions each with a bead core embedded therein;
• a toroidal carcass extending between the bead portions;
• and a sidewall rubber disposed axially outside the carcass in each of the sidewall portions, wherein
• each of the bead portions has a bead bottom surface which contacts with a bead seat of a wheel rim when the tire is mounted thereon,
• the bead bottom surface comprises an axially inner region including a bead toe and an axially outer region including a bead heel,
• the axially inner region is formed by a canvas chafer, and
• the axially outer region is formed by the sidewall rubber extended radially inwardly from the sidewall portion,
• wherein
• the sidewall rubber extends from a position in the tire axial direction corresponding to a position in the tire axial direction of the centroid of the bead core to a position in the tire radial direction corresponding to a position in the tire radial direction of the outer end of the bead core, while having a substantially constant thickness,
• each of the bead portions is provided with a clinch rubber having a complex elastic modulus larger than that of the sidewall rubber,
• the clinch rubber includes a first clinch rubber arranged between the sidewall rubber and the carcass, and
• the canvas chafer comprises:
• a first portion extending axially outwardly from the bead toe along the axially inner region,
• a second portion extending radially outwardly from the bead toe along a tire inner surface facing a tire cavity,
• a third portion extending from the first portion and overlapped with the sidewall rubber on the radially outside thereof in the axially outer region, and
• a fourth portion extending radially outwardly from the third portion, and a radially outermost end of the fourth portion is positioned radially inner to a radially innermost end of the first clinch rubber.