Pneumatic tire and crosslinked rubber composition

A pneumatic tire comprising:

• bead cores provided on a pair of right and left bead portions, respectively, a carcass ply extending from a crown portion to the both bead portions through both side wall portions and moored to the bead cores,
• an inner liner disposed at an inner side than the carcass ply in a direction of a tire diameter, and
• a tread disposed at an outer side than the carcass ply in a direction of a tire diameter and having a volume of the low density region of 35% or more at elongation by an applied stress of 1.5 MPa, a volume of the void portion of 7.5% or less at elongation by an applied stress of 3.0 MPa and a glass transition temperature of −20° C. or lower,
• wherein the low density region is a region having a density of 0.1 to 0.8 time the density of a crosslinked rubber composition before the elongation, and
• wherein the void portion is a region having a density of 0 to 0.1 time the density of a crosslinked rubber composition before the elongation.