fritz- the two types are hub-centric and lug-centric.
factory wheels are hub-centric and therefore uses the flat washer type lugs. this means that the hub keeps the wheel center, the lugs just keeps the wheels and hub together.
aftermarket wheels are usually lug-centric and therefore uses the tapered type lugs. this means the lugs hold the wheels center, not the hub. centering rings are used to aid the installation of the wheels to the hub. the rings are not required.
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