Abstract: A heavy duty pneumatic bias tire having a thick case gauge is disclosed, which comprises a carcass of a bias structure composed of a plurality of carcass plies each containing organic fiber cords and a plurality of bead rings spaced from each other in each of bead portions of the tire, both end portions of a plurality of the carcass plies being turned-back around each of the bead rings from the inside to the outside of the tire. In the tire of this type, the ends of the carcass plies turned-back around the bead rings except the axial innermost bead ring are positioned in the outside of the region "C" between the planes "A" and "B" in each of sidewall portions of the tire.

Abstract: The pneumatic tire is designed particularly to counteract unwedging of the tire. It is mountable on a rim having a protrusion (referred to as "hump") of ordinary shape. The bead has two bead rings, one of which is close to the bead tip while the other assures the blocking of the former in case of strong axial forces, which permits the bead tip to cooperate more effectively with the hump of the rim.