The Bridgestone Potenza RTF tires are faulty. I have purchased 10 tires as a result of bubbles forming on the sidewalls causing a blowout while driving twice. The tires are not safe to drive. Bridgestone says it's caused by me. This is not the case. The car has only 31000 miles. I own other vehicles and have not replaced any tires due to bubbles and blowouts. I drive those cars more frequently. Something needs to be done. There are complaints on Safecar.gov and Tirerack.com. Be safe rather than sorry!