wheel cover; hubcap
Refers to a decorative or protective cover attached to a car wheel. Often used interchangeably with ホイールキャップ, though ホイールカバー may imply a larger cover that hides more of the wheel.
See also: ホイールキャップ
I bought new wheel covers and changed the look of my car.
The hubcap came off while the car was parked.