Abstract: A wheel rim displacement measuring apparatus which measures radial and axial displacements of a rim wall on the basis of a nut seat pitch circle. A wheel to be measured is mounted on a lower head on the basis of a hub hole center and rotated about an axis of the lower head. An upper spindle which is horizontally displaceable relative to the lower head is adjusted in position so as to align with a nut seat pitch circle center of the wheel and is rotated about the axis of the lower head. A Fourier analysis is carried on a wave of the displacements of the upper spindle so that an eccentricity amount of the nut seat pitch circle center from the hub hole center of the wheel can be calculated from the first harmonic. In a computer, a wave of the displacements of the rim wall measured on the basis of the hub hole center is amended in calculation to a wave of the displacements of the rim wall from a true circle having a center at the nut seat pitch circle using the first harmonic wave.

Abstract: A wheel shaping apparatus including a single cotter for expanding first and second dies circumferentially split into a plurality of first and second die elements, respectively. The single cotter is supported by a cotter supporting member at one end portion of the cotter and is also supported by a cotter guide at the other end portion of the cotter during shaping of a rim element. Because of the single cotter supported at both end portions thereof, rim bead seat portions located at axially end portions of the rim element are shaped in an accurate alignment with each other and almost exactly parallel to each other. In the case when ring-like members are provided around the first and second dies or when teeth are formed at sides of each first and second die element, formation of local deformations at gaps between two adjacent first die elements and between two adjacent second die elements is suppressed.