Originally Posted by YellowJellyBean
-Cue flame war over hub-centric vs. lug-centric-
I'm sure for most people's DDs it doesn't matter if their wheels are lug centric. From an engineering perspective, though, it makes a lot more sense to put that load on the bigger hub rather than put an increased cyclic stress on the significantly smaller lug nuts.
begin flame war!
the wheels vertical load is not carried by the hubcentric rings or the studs. The vertical load of the wheel is carried by the friction between the hub face and wheel. The studs are only loaded in tension, to provide this friction force. I calculated out once that each wheel has over 14000lbs friction force. ie. it would take 14000lbs load on a wheel to cause it to slip against the face. therefore even if you did have rings, there would be negligible load on them. They really only just centre the wheel.
I autocross on wheels without hub centric rings. they tend to melt when the brakes get hot. i've had no probs with no rings.