What is the plastic cover on the outside of the wheel called

The plastic cover on the outside of the wheel is called a wheel trim or hubcap. These terms are often used interchangeably, though there are subtle differences. Wheel trims are typically plastic covers that clip onto steel wheels to improve aesthetics, while hubcaps can be made of metal or plastic and may cover the entire wheel centre.

Wheel trims are common on budget or entry-level models like the Vauxhall Corsa or Ford Focus, where manufacturers use steel wheels with plastic covers to reduce costs. Higher-end models often have alloy wheels, which don’t require trims.

If your wheel trim is damaged or missing, replacements are widely available. Here’s what to consider when buying one:

1. Size: Match the diameter (e.g., 15-inch, 16-inch) to your wheels.
2. Fitment: Ensure the clips or retaining mechanism align with your wheel type.
3. Design: Some trims are model-specific, so check compatibility with your car.

While wheel trims are mostly cosmetic, they also protect wheel nuts from corrosion and dirt. If you frequently drive on rough roads, consider securing them with anti-theft clips, as they can pop off easily.

From a mechanic’s perspective, that plastic cover is known as a wheel trim. It’s a decorative piece that snaps onto steel wheels, often found on economy cars. Unlike alloy wheels, which are exposed, steel wheels use trims for a cleaner look. They’re prone to falling off over potholes, so check them regularly. Replacement trims are cheap and easy to install—just press them into place until they click.

The plastic cover on the outside of the wheel is called a wing (or wheel arch). The wing is an external body panel that covers the wheel. It is named after its resemblance in shape and position to a bird's wing on older vehicle bodies.

The wing is the external body panel that covers the wheel and is further categorised by its mounting position as either a front wing or rear wing.

1. Front wing: The front wing is mounted at the front wheel and must accommodate the maximum clearance for wheel rotation and suspension travel. Designers therefore use wheel travel diagrams based on selected tyre specifications to verify the suitability of the wing's dimensions.
2. Rear wing: The rear wing features a slightly arched and outwardly curved profile for aerodynamic considerations.

The primary function of the wing is to prevent gravel and mud flung up by the wheels from splashing onto the underbody of the vehicle during driving. Wings must be manufactured from materials that are resistant to weathering and offer good formability for production.