I purchased a new 2007 Acura RDX with Michelin Pilot tires. Within 7 months, I experienced two sidewall blowouts while traveling at highway speed. I travel on well maintained and heavily traveled roads. Both times, I was told I must have ran over "something" . Both were large holes in the sidewall. I replaced both tires with more the same tire, bought at the dealer for over $300 per tire. The vehicle takes a hard to find size tire. Last month, the remaining two original tires went flat overnight. I gave up and bought 4 new Bridgestonr tires as I felt the Michelins were unsafe. The tires did not last more than 22, 000 miles and a sidewall blowout is not usual. They are unsafe and defective.