Pre-cure tread for retreaded tires and retreaded tire using the same

摘要

PROBLEM TO BE SOLVED: To provide a precure tread for a retreaded tire which can be suitably joined to a base tire and to provide the retreaded tire superior in durability and snow/ice performance.SOLUTION: The precure tread for the retreaded tire includes a cap rubber layer positioned at the surface side to form the grounding face of the retreaded tire and a base rubber layer positioned at the back face side to form a joining face with the base tire. The cap rubber layer is composed of foamed rubber with a foaming rate of ≥14% and ≤30%. A contour at the back face side of the precure tread center part in a cross section view in a width direction is a curved line with a curvature radius of ≥500 mm and ≤800 mm, and a contour at the back face side of a precure tread end is a curved line with a curvature radius of ≥80 mm and ≤300 mm. There is also provided the retreaded tire using the precure tread for the retreaded tire.