The present invention relates to a rim and an assembly of the rim and a tire which are applicable to both a safety tire and a conventional tire. The object of the present invention is to provide a rim and an assembly which enable safe running even when the inner pressure of the tire is lowered or when the vehicle is cornering sharply, and which are usable with not only a safety tire but also with conventional tires. A wheel rim and an assembly of the rim and tubeless tire of the present invention are characterized in that an annular groove (3) is provided axially outside a well (2) in such a manner as to extend in the circumferential direction, and a hump (4) is provided axially outside the annular groove in such a manner as to extend in the circumferential direction. The tubeless tire is characterized by being provided with a toe portion (13) and a hump groove (14) which are adapted to engage the annular groove (3) and the hump (4), respectively.