This easy to use conversion eliminates your trucks old ball bearing type wheel bearings with modern tapered roller bearings. in.Old style in. ball bearings fail because of today's driving and road conditions making your truck unsafe. Tapered bearings can handle more side load and can deal with today's roads easily. Things like radial tires and rain grooves and disc brake upgrades that would cause ball bearing to fail will have no effect on tapered roller bearings.