Daryl, As to why we haven't
Daryl, As to why we haven't replaced them...our BMW dealer told us that if we replaced the tires with non-run-flats, we would invalidate our 3-year warranty. The streets in the NYC tri-area are very bad after our disastrous winter (and failed government), and the dealerships just blame it on that. However, when we took this car in 2012, the salesman INSISTED that we buy tire insurance. He was so adamant that we did, and this has covered the cost of towing and tire replacements, which would have had a retail cost of more than US$8,000 by now. Still, it doesn't compensate us for the time it takes to get these tires (we often have to leave the car for 3 - 4 days), and it surely doesn't make up for being left on dark roadsides awaiting the tow man, who invariably says that he "tows a lot of these BMWs with run-flats." Worse still, the RFTs run so hard that we've also had to replace the front suspension! We've been patient because we do love the car...but our affection has been defeated by these tires.