a lot of the summer tires are actually soft enough that over night they can actually develop a flat spot when its colder out and they cool off in that position over night . my car will actually vibrate for about the first 10 to 15 mins driving when its cold outside until the tires warm up a little and they are just dunlop sport tires . the vibration is not bad at all but its enough you can feel it in the wheel . its usually right between 65 and 70 that its the most noticeable . once they warm up it goes right away . btw the softer the compound of the tire the worse this affect can be . pay attention to when it does it . it may be just that simple .
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