hi guys new to the forum and some great info and help given to many members as i spent reading through previous posts, i have a 530i had the wheels balanced and aligned it sits on 18" act's split rims since having the car i have never had the opertunity to drive over 60mph as it violently shakes have been to my local bmw dealer who said they were unable to help as they have no where to take the car and test this , i have read in past threads of different things that may cause this(sorry to bore any one as it seems a common fault) please if anyone can give me any info regarding this... and thanx in advance