Method of high speed centrifugal run-out grinding of a pneumatic tire

A method for correcting the radial run-out and radial force variation of a pneumatic tire (12) with a tire uniformity machine (10). The tire is rotated at a high speed and radial run-out is measured. A center grinder assembly (24) is incrementally advanced into contact with sections of the tire having intrinsic radial run-out until all values of radial run-out about the tread circumference are within an acceptable value of radial run-out. In addition to the advancement of the center grinder assembly (24), top and bottom tread shoulder grinders (40A, 40B) may be advanced into contact with sections of top and bottom shoulder regions of the tire having phase adjusted lateral run-out. The extent of the advancement of the shoulder grinders into contact with the tread shoulders of tire is dictated by a control signal generated by a computer program from the initial measurements of radial run-out. Tangential force variations of the tire occurring when the tire is rotating at a high speed are also expected to be reduced due to the grinding of the tire.