Abstract: An indexing and locking assembly for a two or three piece truck tire rim and which rim presents at least a base and a locking ring which is attached to the base to complete the same for mounting of the tire upon the rim. Means are provided on the base for indexing the ring with respect to the base, there also being means on the base and cooperating with the indexing means for locking the ring on the base. The indexing and locking means correct for disparaties such as out of roundness of the base or ring; physical deformation of the ring; or a mismatch between the ring and the base to which it is being attached, all to the end that the ring is properly placed upon and attached to the base and will not unexpectedly detach from the base during handling of the truck tire and rim whereby to cause injury to persons or damage to property.