The wheel hub bearing is the core component of wheel rotation, responsible for supporting the vehicle's weight and ensuring smooth turning. Evolving from early single-row ball bearings to today's highly integrated hub units, its design has become increasingly precise. Modern hub units are typically sealed and pre-lubricated for maintenance-free operation and high reliability. Their condition directly affects driving safety, noise levels, and fuel efficiency. A faulty hub bearing can generate abnormal noise, cause overheating, and even lead to wheel lock-up, making regular inspection essential.