I have a 2013 740 Li with 66,730 miles. I bought it used over a year ago with 28,000 miles. Last night I had a flat, but made it home safely. Took the car to the tire store this morning and discovered the main tread separating from the tire. The tire is the Good Supercar F1, runflat. The technician decided to check the other tires and they are all showing "signs" of separation or small bulge in the tread pattern specifically towards the inside edge of the tire, where the tread meets the sidewall. The car has always been aligned properly. Additionally during the inspection we noticed that each wheel had a small crack in it. The cracks were observed on the inside edge of the wheel. One wheel had a crack that was starting to spread into the barrel of the wheel. Has anyone else experienced this problem with cracks in their wheels? I am cautious to avoid potholes and consider myself a careful driver, but for each wheel to have cracks, I find this a bit usual. Is there a fix or am I in the market for new wheels?