Tire treads with reduced undertread thickness

A method for retreading a tire, the method comprising:

• providing a tire tread having
• a tread thickness bounded by a top side and a bottom side and opposing lateral sides, the tire tread bottom side configured to attach to an annular tire carcass,
• a groove extending into the tread thickness from the top side and terminating within the tread thickness at a groove bottom arranged between a pair of opposing sides defining a width of the groove, where a thickness of the tread extends from the groove bottom to form a protruding portion of the bottom side below the groove bottom such that adjacent portions of the bottom side located adjacent the protruding portion are recessed within the tread thickness from an outer side of the protruding portion;
• and
• a plurality of strengthening members arranged along the groove bottom, the plurality of strengthening members forming protrusions extending into the groove from the groove bottom and from at least one side of the pair of opposing groove sides, the plurality of strengthening members being arranged along a length of the groove;
• providing an annular tire carcass having an annular tread-receiving portion;
• arranging a layer of bonding material between the tire tread and the tire carcass;
• and
• applying the tire tread to the tire carcass, such that the protruding portion of the bottom side below the groove bottom extends into a thickness of the layer of bonding material.