One problem related to tire bead has been reported for the 2011 BMW 328. The most recently reported issues are listed below.
I have bridgestone driveguard run flat tires . . . Just had my 3rd blow out of a front tire in the last 18 months. Only 3 blow outs I've ever had in 48 years of driving. The blow out today was the replacement tire for the blow out 18 months ago . . . So quite new with little wear. In all 3 cases the tire blew out (fractured) where the bead intersects the tire rim.