Abstract: An apparatus and method for making possible an infinite variation in the adjustment angle of a spindle assembly makes possible a rapid changeover for testing the dynamic properties of elastomeric objects. In spindle assembly (10), wedge rings (18, 20) having wider portions (22, 22a) and narrower portions (24, 24a) interposed between a spindle (12) and an axle assembly (17), whereby the relative placement of the wider portions (22, 22a) and the narrower portions (24, 24a) determine the angle of the spindle (12) relative to axle assembly (17). Indicia (48, 48a) on the wedge rings (18, 20) make possible quick determination of the exact angle. Means (50, 50a, 67) may be provided to make easier rotation of the wedge rings (18, 20).

Abstract: An apparatus 10 for adjusting the cant of the axis of rotation of an annular article with respect to a fixed axis. The apparatus 10 having at least one set of wedge rings 30 disposed between a back plate and a spindle plate. The back plate being fixed with respect to the fixed axis and the spindle plate being fixed with respect to the axis of rotation of the annular article. In a preferred embodiment, the apparatus 10 being capable of adjusting both the slip and camber angles of a tire.