Magic, Sorry, but I don't see what a pan of water spinning on a vertical axis has anything to do with a tire spinning on a horizontal axis while running in contact with a road surface. A better analogy would be a barrel half full of water rolling down a hill. Does the water spread itself aroung the perimeter of the barrel? No, it stays on the bottom because gravity makes it stay there. If your washing machine becomes unbalanced because all the clothes are on one side, does if balance itself back out? No, you have to stop it, spread the clothes back around and restart it. I'm aware of the "balance rings" you can buy at any truck stop. J. C. Whitney used to sell them (probably still do), along with all sorts of wonderful products that would double your gas mileage, etc. I'm sure that many people claim they work or they wouldn't sell them. My guess is that they provide enough damping to noticeably reduce vibration, but they sure don't improve the actual balance of the tire. Think about it: If these products actually work, why would any tire dealer spend thousands of dollars on spin balance equipment? This should be a simple test for anyone with access to a spin balancer: Take a mounted tire and deliberately unbalance it. Then dismount it and throw in a golf ball. Check the balance again: Is it better, worse or the same? Anyone got a spin balance machine?
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