Quote:
Originally Posted by 08SeCamry
why do i need a hub ring, not familiar with these?
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Without it, there will be a gap between the hub of the car and the wheel. The wheel will be held by the lug bolts only. Your wheels will be susceptable to vibration and instability. Take a look at this diagram I found online...

The hub rings keep the wheel centered on the hub and provide more stability. The little piece of plastic or aluminum may seem trivial, but it makes a world of difference when you're going 60-70+ mph.
I hope that helps.