I just got my SSR Competitions (18"x8") in today and installed them at a buddies house. Only problem is they came with 4 hubcentric rings and 4 wire rings. The wheels didnt look right with the rings (lug nuts stuck out and there was a gap between the hub and wheel), so I put the wheels on without them. Ive only driven like 5 miles, but they seem fine. The guy at tirerack said I need them though. What exactly do they do and are they neccessary? Ive had aftermarket wheels on my other vehicles and they never had a gap between the hub and wheel like that, it just doesnt seem right. This is for a '01 Impreza 2.5RS if it makes any difference.