Originally Posted by ThomasGS4
I've always heard that aluminum are best. The plastic ones break/melt etc.
false and false
I work in a wheel/tire shop and we carry both but I ONLY use and plastic on my vehicle and recommend the same to all our customers. The hubs never get hot enough to melt the hub-rings and the only way to break the rings is by leaving them on the car when putting back your factory which ends up crushing the rings. The polycarbon plastic is actually very hard. The only purpose is to center the wheel so there is no movement (which leads to vibrations). Its not like there's a ton of pressure or stress on them.
Being that the hubs on our vehicles are steel and the rings are aluminum, we see VERY often that when the hubs begin to have some rust and the aluminum rings begin to corrode they often fuse together making them almost impossible to remove. If you do use aluminum I highly recommend using a wire brush to clean the hub and use bearing grease or Never Seez to prevent them from seizing