If they are new tires, take them to a place that has road force balancing, and some one that knows how to use it. It often means dismounting the tires and remounting before balancing again. I battled it for months and 3 sets of tires is how I know. Mine now runs very smooth at all speeds.
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2000 Boxster - Loved and sold
1999 911 Cabriolet - Also loved and sold.
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