The main difference between a wheel hub and a bearing is how their assembling. Wheel bearings can be disassembled, lubricated, and reassembled for reuse. On the other hand, hub bearings come pre-packed by the manufacturer and are sold and installed as it is. They cannot be taken apart, and therefore replacement is the only option.
Wheel bearings have a lifespan of 136,000 to 160,000 kilometres. However, the actual life of wheel bearing depends on its quality and operating conditions. The wheel hub assemblies typically last for about 120,000 kilometers. A few signs of a bad wheel hub are: