There are some wheels that are lug centric and don't need to use a centering ring. The usual types of vehicles that have these types of wheels are SUVs and trucks. For this structure, the middle bore of the wheel is bigger than the car's hub circumference and has to be installed by a professional with the wheel assembly off the ground when the hardware of the lug is attached. The middle hole is usually oversized to assure that the fitment will be matched to different car sizes.