High speed vibrations Options

[Coligion]

My car just hit 96k miles, but this high speed vibration issue has always been a problem. When going over 55 mph, I'll get a ton of vibration from the steering wheel. I do have aftermarket wheels/tires. When I first bouht the wheels, I did not have centering rings and believed that would solve the problem. No dice. Even after getting the correct sized rings the car still vibrates. Before getting the rings, I did have the alignment and the wheels balanced. I wouldn't think inserting plastic hub-rings--in the center of wheel--could offset the balance, right? The shock/struts are relatively new, so it couldn't be that. Also, the car had this vibration problem even with the original wheels....Any helpful advice is appreciated.

[Mstoochn]

aftermarket rims are most likely your problem, i bought cheap rims that were not 100% True (OUT OF ROUND) and causes my car to vibrate over 70MPH, does it calm down at certain speed brackets? thats the best indication that your rims are F'd like mine, (they only need to be out 2mm' to be a noticable vibration)

crusing 35-40 MPH i get a wheel hop
70-85 MPH wheel vibration
100-120MPH serious vibration

notice the speed brackets.