When I ordered my Slipstreams, the guy asks if I want the hub rings with the wheels. I wasn't sure why, so I asked, and he basically said it takes some of the pressure off of the lugs, and puts it into the wheel itself. So I imagine they're helpful, I haven't driven on my slips without them, I don't know what the difference would be. Basically a more secure fit and less chance of damage.
Hopefully someone else with some knowledge of this will post and help us out. That's my 2cents!! Hope it helped a little.
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