This disclosure relates to retread molds adapted for manual, semi-automatic or full automatic operation and specifically is directed to a pair of relatively movable platens carrying matrix means for receiving a tire therein with bead aligner wheels associated therewith, the bead aligner wheels being in axially opposed relationship to each other, an annular bladder disposed between the platens, the annular bladder having innermost peripheral marginal portions, the marginal portions being in overlying relationship upon the bead aligner wheels, and means for creating an annular gap between a terminal edge of each bladder peripheral marginal portion, an outboard portion of each of the bladder peripheral margins and the associated bead aligner wheel, the annular gap creating means being defined by an annular bead carried by each outboard portion and/or terminal end of each bladder peripheral marginal portion in sealing contact with its associated bead aligner wheel.