At 15k miles I just swapped out all 4 tires. Have had 2 sets of rears and 1 set of fronts. Up until now it seemed the only 2 options for 21" wheels were the Michelin PS 2's and the Continentals. I've had the PS 2's since the car was delivered. They are much quieter than the Continentals but unfortunately crazy expensive at about $2,100 for a set of 4. My local tire guy just told me about the new Michelin Super Sport tires. Michelin just started making them in the Model S 21" size. They have the same performance and quietness as the PS 2's but are much cheaper. Set of 4 was $1,350. I thought a few of you would like to know.
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