A lockring which fits between the rimbase and removable bead seat band of the rim for a large pneumatic tire and having surfaces mating with surfaces of the bead seat band and rimbase disposed at angles with which result in great frictional contact when the tire is inflated. This produces a wedging effect and eliminates the need for ''''drivers'''' which are interengaging lugs on the rimbase and removable bead seat band to prevent relative rotation of these parts.