Methods for retreading tires

A process for retreading a tire, the process comprising the steps of:

• (i) providing a tire casing;
• (ii) providing a cured rubber component having first and second planar surfaces, where the first planar surface includes a tread pattern;
• (iii) mixing a functional polymer including at least one functional group, a crosslinking agent, and a carbon black filler to form an extrudable cushion gum mixture, wherein the functional polymer including at least one functional group has a number average molecular weight of from 50 kg/mole to 500 kg/mole and wherein the at least one functional group is a hydroxyl or organic acid anhydride group, and wherein the crosslinking agent is a multi-isocyanate or a multi-amine that will react with the functional group of the functional polymer;
• (iv) extruding the extrudable cushion gum mixture directly on the tire casing to form an extruded cushion gum;
• (v) applying the second planar surface of the cured rubber to the extruded cushion gum to form a tire composite;
• and
• (vi) treating the tire composite to thereby form a retread tire, where said step of treating the tire composite takes place at a temperature of below 110° C.