Abstract: This disclosure relates to a method of retreading a tire by inserting a tire and an annular bladder between a pair of open matrices with marginal portions of the bladder projecting beyond beads of the tire and resting upon peripheral edge portions of axially opposed bead aligner wheels; the annular bladder being disposed within the tire; inflating the bladder to form an annular gap sealed between an annular terminal edge of each bladder marginal portion, an annular outboard portion of each bladder and opposing annular portions of the bead aligner wheel peripheral edge portions; closing the matrices, and further inflating the bladder to urge the tire into intimate conformity with the matrices.