The configuration of lug nut placement on a wheel hub for a specific vehicle model, in this instance the 2008 Saturn Aura, dictates the wheel’s compatibility with the vehicle. It is defined by two critical measurements: the number of lug studs and the diameter of the circle on which these studs are arranged. For example, a 5x115mm specification indicates five lug studs positioned on a circle with a diameter of 115 millimeters. This specification ensures proper wheel centering and secure attachment to the vehicle.
Adherence to the correct specification is crucial for vehicle safety and performance. Using wheels with an incompatible configuration can result in wheel loosening, vibrations, and potential wheel detachment, leading to accidents and vehicle damage. Historically, various manufacturers have utilized different configurations across their vehicle lineups, making it essential to verify the correct specification before purchasing or installing aftermarket wheels. The specific configuration is often found in the vehicle’s owner’s manual, online databases, or through professional tire and wheel retailers.