A curing mold for a tire. The curing mold is in the form of a hollow cylinder, and has two parallel opposite sidewalls defining the base walls of the curing mold and having respective inner retaining surfaces; and a number of lateral sectors arranged successively to define the cylindrical lateral wall of the curing mold. Each sidewall has at least one seat formed through the inner retaining surface, at the outer edge of the inner retaining surface; a movable member housed inside the seat and movable between an extracted position, in which the movable member projects at least partly from the seat, and a withdrawn position, in which the movable member is housed completely inside the seat; and at least one elastic push member for pushing the movable member out of the seat into the extracted position.