One problem related to tire bubble has been reported for the 2013 BMW 550. The most recently reported issues are listed below.
I have goodyear 245/40r19 run flats on my vehicle. A huge bubble came up and I took it to the dealership. They said it was due to impact and not covered on my warranty. I know, there has been no impact. Since then another bubble on another tire has manifested. It is a cost of over $1000 to replace the two tires. Very frustrating when reading all the complaints online; clearly there is an issue.