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"Most aftermarket wheels are manufactured with a center hole that will fit a wide range of vehicles. The hub-centric ring is used to fill any gap that may exist between this hole and the vehicle's hub, thus centering the wheel on the axle. If you have vibrations after installing new wheels, chances are hub-centric rings were not used."
Don't worry about it... I think almost any wheel available now is going to be hubcentric.
Hubcentric means the center hub keeps the wheel centered and holds the weight. The lugs just make sure it doesn't fall off.
Lugcentric allows tapered lugs to support all the weight and center the wheel. Doesn't center well this way and is just an inferior design from what I've heard.
Hubcentric means the hub (center hole) of the wheel is machined (or uses adapter rings) to fit the exact diameter of the the hub/spindle of the car. This is the primary means to perfectly center the wheel and insure it spins true.
The other varient is lugcentric, which means the lugnuts take on the duty of perfectly centering the wheel, and the hub bore of the wheel is unimportant.
I would think you'd have a tough time to find a c5 wheel that isn't hubcentric, so I wouldn't worry too much about that.