Tire tread and a tire comprising a tread

A tire tread comprising:

• a circumferential tread cap having circumferential grooves and comprising a tread cap rubber compound, the tread cap rubber compound having a Shore A hardness which is within the range of 45 to 75,
• at least one circumferential groove reinforcement reinforcing at least a bottom portion of at least one of the grooves and comprising a groove reinforcement rubber compound, the groove reinforcement rubber compound having a Shore A hardness which is within the range of 70 to 100,
• a circumferential tread base layer arranged radially inwards of the tread cap and comprising a tread base layer compound, wherein the tread base layer compound has a Shore A hardness which is within the range of 15 to 50, wherein the base layer has a cushion of an essentially trapezoidal shape which extends only between an axially outer edge of the base layer and the adjacent groove, wherein the cushion extends axially over at least 30% of the distance between said axial outer edge of the base layer and the adjacent groove, wherein the cushion has a maximum thickness which is within the range of 50% to 95% of the radial distance between the groove bottom of the groove which is adjacent to the cushion and the radially inner side of the base layer at the position of the groove, and
• wherein the Shore A hardness of the tread cap compound is higher than the Shore A hardness of the tread base layer compound, and wherein the Shore A hardness of the groove reinforcement compound is higher than the Shore A hardness of the tread cap compound.