I've had good experience with Yoko's, but no tire company is completely defect free over a production run. I had a similar problem to yours with some General tires and it was definitely a defect. Some error in manufacturing resulted in a stiff spot in the tires (where belts overlap??), so that they spun just fine on the balancing machine but when you put them on the road, the stiff spot would not flex as easily as the rest of the tire, so you got the vibration.
Being a new car it was a tough fight to get the dealer to acknowledge the faulty tires and exchange them, but in the end they did the right thing. I convinced them by putting a pair of snow tires/rims on the front and taking their service manager for a short drive, demonstrating that even the knobby winter tires were much smoother - night and day.
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Bob: son's XC70, dtr's '94-940, my 81GL, 83-DL, 89-745(V8) and 98-S90. Also 77-MGB and some old motorcycles.
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