The specification defines the configuration of the wheel mounting studs on a vehicle. Specifically, it describes the diameter of the circle formed by the centers of the wheel studs and the number of studs present. As an example, a 5×114.3 notation signifies five studs positioned on a circle with a diameter of 114.3 millimeters.
Understanding this specification is crucial for ensuring proper wheel fitment. Using wheels with an incorrect configuration can lead to wheel damage, vibration, and potential failure, compromising vehicle safety. Historically, manufacturers have adhered to specific configurations for each model year, ensuring interchangeability within a certain range, simplifying wheel selection and replacement.