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looks like they mount up with the wheel? Do they ahve bearings in them or something to distribute weight? how do they work? (far too lazy to google it )
yes they auto balance your tires. As your tires wear or pick up snow or dirt they will adjust and balance your tires. I needed new tires and wanted to find something that would make them last longer and stay balance for I was tired of having to take them of and on all the time to balance a rotate them just to get a good ride, only to have a weight come off down the road. I will not own another truck with out these things. Go to Centramatic web site for more details. www.Centramatic.com