Mold for forming a tire and tire production method

A mold for forming a tire for vulcanization molding of an unvulcanized raw tire into a tire, the mold comprising:

• an annular tread molding part which is divided into a plurality of segments arranged in a circumferential direction and which is configured to be opened and closed by moving each of the segments in a radial direction, wherein
• each of the segments includes:
• a plurality of design surface dividing mold parts, each of the plurality of the design surface dividing mold parts includes a tread design surface for forming a tread of the tire, the plurality of the design surface dividing mold parts are arranged in the circumferential direction of the segments, and the plurality of the design surface dividing mold parts are configured to rotate around a rotatable shaft parallel to an axis of the tread molding part when the tread molding part is opened after vulcanization molding of the tire;
• and
• a holder to be driven toward a radially outer side by a container when the tread molding part is opened,
• each of the plurality of the design surface dividing mold parts is supported by the rotatable shaft to be rotatable in relation to the holder,
• the annular tread molding part includes spring members which are attached between the plurality of the design surface dividing mold parts and the holder to retain the plurality of the design surface dividing mold parts at a predetermined position, and
• when the tread molding part is opened, the spring members elastically deform to allow for rotation of the plurality of the design surface dividing mold parts in relation to the holder.