Abstract: To derive suitable contact geometry, initial contact geometries are selected somewhat arbitrarily for the cup and cone raceways and for the roller side faces. Using the initial contact geometries, the internal bearing misalignments, that is the misalignment between the cup raceway and the rollers and the misalignment between the cone raceway and the rollers, are computed for each segment of the load cycle. From the internal misalignments so derived, modifications to the selected contact geometries are computed to create altered contact geometries which theoretically produce substantially uniform life along the lines of contact between the raceways and rollers. But these altered contact geometries produce different internal misalignments for the various segments of the load cycle, so new internal misalignments are calculated for the altered contact geometries.