the drawings the locating device is engaged on the wheel and tire assembly 10 which is shown with parts broken away the locating device is engaged and held in place against the tire rim 18 by the curved end edge 16 of the mounting plates 15 for the proper positioning of the rim and tire assembly 10 onto the wheel disc 21 in use the locator device may first be suspended from the ends of the spaced radial arm portions 22 of the straight wheel disc 21 as hereinbefore described indicating the proper wheel alignment in relation to the axis of a vehicle 39 s axle as indicated on the target 26 by the light beam and magnetic indicator 29 the locator device is then removed and the rim and tire assembly 10 is mounted to the wheel disc 21 the locator device is then secured to the tire rim 18 as seen in fig5 of the drawings and the light source 19 indicates the relative position of the rim and tire assembly 10 on the target 27 so adjustments can be made to the rim and tire assembly 10 bringing it into proper alignment as indicated by the light beam from the light source 19 striking the position marked with the magnetic indicator 29 on the target 28 the rim and tire assembly 10 is then tightened in place providing proper alignment in relation to the axis of the vehicle 39 s axle the locator device thus determines the proper alignment of the vehicle 39 s wheels and tires by providing a reference guide that can easily be matched by a visual observation it will be apparent to those skilled.