Abstract: An annular filler mountable in the well of a one piece car or truck wheel rim for increasing the diameter of the well to a point where that bead seating diameter generally corresponds to the diameter of the tire size which is intended to be mounted on that wheel. Thus when a tire is mounted by placing one portion of its bead into the well while the diametric opposite portion of the tire bead is forced over the rim flange, only a tire having a correct bead seating diameter will be able to pass over the wheel flange and a tire with an incorrect bead seating diameter cannot pass over said flange.

Abstract: This invention relates to tire testing apparatus and, more particularly, to an improved roadwheel for use with tire testing apparatus of various types which are capable of more accurately measuring the roadability and wear characteristics at high speeds of rotation. The roadwheel has angularly-inclined web plates connecting its hub and rim portions to provide greater stability and durability at greater stresses caused by increased centrifugal forces. The wheel also provides greater margins of safety in tire testing operations.