The specification that defines how a wheel attaches to a vehicle’s hub is crucial for compatibility and safety. This measurement indicates the arrangement of the lug studs or bolt holes on the wheel hub and the corresponding wheel. It is expressed by the number of studs/bolts and the diameter of the circle they form. For instance, a designation of 5×139.7mm signifies a five-lug pattern on a circle with a diameter of 139.7 millimeters.
Understanding this specification is paramount for ensuring correct wheel fitment. Using wheels with an incorrect measurement can lead to wheel detachment, potentially causing accidents and damage. The proper specification guarantees a secure connection between the wheel and the vehicle, contributing to handling stability and overall vehicle safety. The evolution of wheel attachment systems reflects ongoing advancements in automotive engineering, with different vehicle models often utilizing distinct specifications to optimize performance and load distribution.