The specification defines the arrangement of the lug studs or bolt holes on the wheel hub and the corresponding wheel. For a 1990 Chevrolet S10, this configuration is typically a 5×4.75″ (5×120.65mm) pattern. This indicates five studs or bolt holes positioned on a circle with a diameter of 4.75 inches (or 120.65 millimeters). Incorrectly matching this specification can prevent the wheel from mounting securely to the vehicle.
Adhering to the correct wheel mounting specification is crucial for vehicle safety and performance. It ensures proper wheel alignment, balanced weight distribution, and secure attachment, all contributing to stable handling and braking. Historically, variations in these specifications have existed across different vehicle makes and models, requiring careful attention during wheel selection and replacement to maintain compatibility and safety standards.