Oliver,
Ithink you got a defective rotor.

Duke,
If you say the weights have to be on both flanges of the rim, I will have to disagree with you. Your theory may be correct and scientific, but for all practical purposes weights on one flange are all that is necessary even for folks like me who like to open it up across the Mohave Desert on the way to Vegas. The only person I know who might be concerned with your theory is my neighbor who lives 20 miles away. When he runs his car it is around 600 MPH and he has special tires that are Kevlar rapped.

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