Each bead of a large pneumatic tire has permanently connected to its bottom an annular metal part serving as a bead seat and formed with a conical bearing surface. The rim for the tire has a fixed or movable axial stop member for each bead. Each axial stop member is formed with a conical stop surface, and the conical bearing surfaces are respectively engageable with the conical stop surfaces. Each pair of engaged bearing and stop surfaces is inclined with respect to the common axis of the tire and rim by an angle within the range of 10* to 30*. The structure prevents the tire and rim from slipping in rotation with respect to each other and is particularly adapted for use on construction equipment and the like.