Equip your semi truck to be Ready for the Road Ahead™, with the National Bearings 3.5" Tapered Outer Wheel Bearing Cone for ProPar Trailer, a key piece to offer proper alignment and reduced component wear. By utilizing a specialized design that features a low-friction spinning method, this replacement bearing is able to distribute the applied weight from various components. Built with a smooth metal assembly to reduce noise and excessive wear. FleetPride is your First Click in Heavy Duty®.