A: We always recommend hub-centric rings for an installation.  
Most issues related to vibration occur because of the failure to install Hub-centric rings.  We do not supply hub-centric rings with the wheels.  The installer should ensure they order or have the appropriate hub-centric rings for each individual application. On a few applications especially with BMWs our product may be hub centric. If you are not sure if this pertains to you, you may ask your local Konig retailer!