The wheel trim x1 is a disc which covers the wheel hub and wheel fasteners, covering the entire front of the wheel on most steel wheels.

Wheel trims are usually made of tough plastic and clipped onto the wheel rim.  The wheel trim x1 covers the hub cap, directly shielding the wheel hub, which is in the centre section of the wheel, offering protection to the wheel as a whole. 

The wheel  trim x1 functions to protect the wheel hub and wheel fasteners, as well as the rest of the wheel, from rainwater, stones, dirt, grit and other road debris which can cause corrosion and damage. Often serving a decorative purpose, wheel trims come in a variety of styles and designs, dependent upon the manufacturer, often displaying the badge or symbol of the car make and/or  model, which adds to the overall style and look of the vehicle.

Subject to damage from road debris and rainwater, and generally depreciating over time due to old age, you will eventually need to replace the   wheel trim x1.  When purchasing just one wheel trim it's important to make sure it will match the other three wheel trims on your car. It's also important to make sure you get the right size wheel trim for the car wheel and that it's a perfect fit for  safety reasons.  You can make sure you get the ideal fit by purchasing a wheel trim x1 that's designed specifically for the make and model of your car.