The phrase "hub assembly" refers to a component of a wheel that holds everything together. It includes the hub itself, which connects to the axle, and the bearings that allow the wheel to rotate smoothly.
Sentences with «hub assembly»
Problem is I have no idea what the part is called, and searching «rear wheel hub assembly» gets me the wrong part. (mechanics.stackexchange.com)
The front wheel bearings would need to be replaced with the front hub assembly unless you have the very specialized puller and press tools to remove and install the bearings. (yourmechanic.com)