A wheel bearing is set of steel balls enclosed by a metal ring. It is positioned on a metal axle shaft within the hub. The wheel hub is the mounting assembly at the centre of each wheel. It holds the bolts that attach the tire to the wheel. The smooth running of your car requires the wheel hubs to be in good condition as these are the main support for the wheels. If they are dented you might notice a grinding noise as you turn corners, or vibration and/or a lack of steering control. Wheel hubs can be damaged by curbs or potholes. The good news is that you can easily improve your ride by replacing wheel bearings and wheel hubs with a high quality product from Euro Car Parts for a great price.