I just got my brand new 18" by 8.5 ac schnitzer replicas,and they are impossible to balance.I had them balanced 4 times within 3 days at 2 different shops.Every time I get the car to around 45mph to about 60mph it starts shaking.On the machine they are balanced, but not on the road.Tires(235/40/18) are brand new too.They rotated the wheels too.they told me to buy a set of new lug nuts,but the new lug nuts came with the rims.Now I got spacers for the rims on the side which I was told were not necessary,but I will try them on today.They said that the spacers were only for old 7 & 6 series.Thanx guys I would really appreciate this help.