A tire mold having a cavity configured to receive a green tire, the tire mold comprising: a flexible bladder disposed in a central portion of the cavity; a first ring (220a; 400a; 500a; 610a; 710a; 810a) connected to a first end of the flexible bladder, the first ring (220a; 400a; 500a; 610a; 710a; 810a) having a first axial length; and a second ring (220b; 400b; 500b; 610b; 710b; 810b) connected to a second end of the flexible bladder, the second ring (220b; 400b; 500b; 610b; 710b; 810b) having a second axial length, wherein at least one of the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) is configured to move between a first position and a second position, characterised in that the flexible bladder is stretched to a maximum axial length when the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) are in the first position, and wherein, when the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) are in the first position the sum of the first axial length and second axial length is greater than a space between the first ring (220a; 400a; 500a; 610a; 710a; 810a) and the second ring (220b; 400b; 500b; 610b; 710b; 810b). a flexible bladder disposed in a central portion of the cavity; a first ring (220a; 400a; 500a; 610a; 710a; 810a) connected to a first end of the flexible bladder, the first ring (220a; 400a; 500a; 610a; 710a; 810a) having a first axial length; and a second ring (220b; 400b; 500b; 610b; 710b; 810b) connected to a second end of the flexible bladder, the second ring (220b; 400b; 500b; 610b; 710b; 810b) having a second axial length, wherein at least one of the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) is configured to move between a first position and a second position, characterised in that the flexible bladder is stretched to a maximum axial length when the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) are in the first position, and wherein, when the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) are in the first position the sum of the first axial length and second axial length is greater than a space between the first ring (220a; 400a; 500a; 610a; 710a; 810a) and the second ring (220b; 400b; 500b; 610b; 710b; 810b). wherein at least one of the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) is configured to move between a first position and a second position, characterised in that the flexible bladder is stretched to a maximum axial length when the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) are in the first position, and wherein, when the first and second rings (220a, 220b; 400a, 400b; 500a, 500b; 610a, 610b; 710a, 710b; 810a, 810b) are in the first position the sum of the first axial length and second axial length is greater than a space between the first ring (220a; 400a; 500a; 610a; 710a; 810a) and the second ring (220b; 400b; 500b; 610b; 710b; 810b).