X-Tracker High Performance Hubs provide increased handling and braking even under the most demanding conditions. X-Tracker is constructed using a unique double row angular contact ball bearing arrangement. This unique design increases the bearing's capacity while improving hub stiffness 50 percent more than a original tapered bearing hub. 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.