I had this for the first approximately 2,000 miles then it seemed to (almost) completely go away. I have the OEM 20" wheels btw. At 15,000 miles I started noticing the vibration much more again, but recently placed my 19" OEM wheels/winter tyres on the car and the high speed, (>75 mph) vibration has now disappeared again. Hence I'm thinking that my 20"s have become unbalanced, so I'll be getting a full Hunter Road Force balance prior to putting the 20"s back on the car.
Bish
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