What Are Your Car’s Wheel Bearings?
As well as supporting the weight of vehicle and occupants, wheel bearings also have to absorb the heat and friction which are generated during typical driving conditions.
Most wheel bearings consist of a set of steel ball bearings, which move around inside a metal frame called a race. This is a bit like a railway track in that it consists of two parallel rings, which should ideally be perfectly circular. The outer rims should be able to hold the bearings tightly, yet still allow the inner bearings to move around freely within this frame.