An agricultural tool includes a wheel body and a flexible tire with a hollow chamber and an inner surface around this hollow chamber; a circular opening on the chamber; a pair of beads bordering this opening; and a spacer at least partially tubular with two axially opposite end faces. Over one portion corresponding to one of the beads, the inner surface extends frustoconically by widening radially outward of the flexible tire, and one of the end faces of the spacer has an axially protruding surface. The spacer is placed across the opening of the tire such that the protruding surface engages the inner surface in an area of the portion corresponding to the bead.

A tire and rim seal is disclosed by which to reliably seal the beads of a tire against the rim of a wheel on which the tire is mounted so as to advantageously prevent the tire from leaking air and slipping off the beads of the rim. The tire and rim seal includes an elastomer that is seated on the rim and a rigid backing that lays on top of the elastomer. A plurality of threaded bolts extend from the rigid backing and run through the elastomer and the rim of the wheel. A corresponding plurality of threaded nuts are rotated around the threaded bolts and tightened against the rim so as to pull the rigid backing towards the rim. Accordingly, a compressive force is generated by which to cause the elastomer to be sandwiched between the rigid backing and the rim so as to expand along the rim and move into sealing engagement with the rim and the beads.

A tire and rim seal is disclosed by which to reliably seal the beads of a tire against the rim of a wheel on which the tire is mounted so as to advantageously prevent the tire from leaking air and slipping off the beads of the rim. The tire and rim seal includes an elastomer that is seated on the rim and a rigid backing that lays on top of the elastomer. A plurality of threaded bolts extend from the rigid backing and run through the elastomer and the rim of the wheel. A corresponding plurality of threaded nuts are rotated around the threaded bolts and tightened against the rim so as to pull the rigid backing towards the rim. Accordingly, a compressive force is generated by which to cause the elastomer to be sandwiched between the rigid backing and the rim so as to expand along the rim and move into sealing engagement with the rim and the beads.