hey fritz
btw, your posts look like spam for some reason.
well, if you're saying that the plastic centering rings on some low-end lugcentric wheels are doing anything other than aiding the wheel installation to the car, that is a big misunderstanding. as you probably already know, plastic centering rings actually melt at high temps from braking. yet, the wheels do not vibrate or brake any studs as it is the lug centering the wheels.
hope this info is useful.