X-Tracker Hybrid Hubs represent the Next Generation of High Performance Hubs. The X-Tracker Hybrid is constructed using an asymmetrical bearing design with tapered roller bearings on the inboard side, and ball bearings on the outboard side. This advanced design blends together the benefits of traditional ball bearing and tapered roller bearing hubs providing better braking and handling while improving steering accuracy. For more than 100 years, the world's engineers, technicians and mechanics have turned to SKF for the best possible solutions. Available for a wide range of applications and needs, SKF products are designed and manufactured to the highest quality standards, ensuring long life and safety.