I know one person's issue can become others by inference so we have to be careful when diagnosing issues.
While some cars may have defects in various parts causing a vibration issue at certain speeds, I generally find that most tire shops don't have the road-force balancing equipment required to properly install tires and then they blame it on BMW.
I suspect, if you look hard enough, all manufactuers have a car here or there that has a defective part somewhere in the drivetrain causing excessive vibration. However, I don't believe there is any widespread issues with BMWs other than folks hitting pot holes and parking curbs and not realizing the damage being caused to high performance suspension systems.
And no, those after market tires/wheels you buy online are not road-forced balanced. It is some chump in a warehouse making minimum wage and you are lucky if the wheel wieghts stay glued on.
2015 435i Convertible
M Sport, M Performance Power Kit
Last edited by chuck92116; 11-05-2012 at 04:53 PM.