Why we make them Your factory Defender carrier bearing is notorious for premature wear, leaving you with an undesirable vibration that will lead to other drivetrain part failures down the road. SuperATV™s Heavy-Duty Carrier Bearing gives a smooth, reliable ride mile after mile. Greaseable and Fully Sealed Unlike the factory bearing, SuperATV's bearing is greaseable and fully sealed, reducing friction. A better bearing combined with easy maintenance means this puppy will run smooth year after year. Self-Aligning Bearing Superior to standard bearings, the SuperATV self-aligning bearing reduces side-load on your carrier bearing from the prop-shaft - a must have if you want to keep vibrations to a minimum and the life of your bearing long. Two-piece design SuperATV is the king of the quick install. The unique, two-piece design makes install and maintenance a breeze. Rather than pressing on a single bearing, SuperATV's two-piece is easily positioned and then secured in minutes. Billet or Cast? We offer our carrier bearing as a 6061 billet aluminum material or an A380 cast aluminum material to meet anyone™s needs and budget. 6061 billet aluminum is stronger than cast aluminum. It is intended for racers and riders who ride hard and frequently push their machine to its breaking point. A3280 cast aluminum is a tough material that™s many times stronger than stock. It™s perfect for the average rider who wants to upgrade to a carrier bearing that™s longer lasting and more reliable than OEM.