The specification indicates the arrangement of lug nuts on the wheel hub of a specific vehicle model year. It defines the diameter of the circle upon which the lug holes are positioned, and the number of these lug holes. For the vehicle in question, it is generally measured in millimeters (mm) or inches, and consists of two numbers, such as 5×114.3mm, where ‘5’ represents the number of studs or lug holes and ‘114.3’ signifies the diameter of the bolt circle.
Understanding this specification is crucial for several reasons. It ensures compatibility when replacing wheels or rims, preventing improper fitment which can lead to wheel detachment, damage to the vehicle’s hub, and potential safety hazards. Historically, this specification has evolved with vehicle design and performance demands, varying across manufacturers and models to optimize wheel strength and load-bearing capabilities. Using the correct specification is essential for maintaining the vehicle’s intended handling characteristics and safety standards.