FYI....although it's a rarity, some tires are defective by being manufactured "out of balance". If that's the case it's almost impossible to balance them and they should be returned for replacement.
Years ago, a name brand, steel belted radial on one of my cars was impossible to balance correctly.......the reason: some of the steel belting "shifted" either while in use or during manufacturing.......it was replaced (at no cost) and I never had the problem again.
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98' Boxster
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