The tooth inclination exists when the lobe (which defines the major axis of the wave generator 12) of the wave generator 12 rotates within and adjacent the flexspline 26, to give the flexspline 26 a corresponding oval shape, having a minor axis and a major axis, with teeth on the radially outer side thereof, the "normal' of each tooth thus being canted or inclined during the sweep of the major and minor axes of the wave generator (camplate) 12 therewithin. At the major axis of the wave generator 12, the inclination of the teeth at the corresponding location on the flexspline 26thereat, is Zero, and likewise with the teeth at a corresponding location on the flexspline 26 at the minor axis