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Hi guys, I recently bought a set of 20" Forgedstar's as street wheels. The car had light vibration after 80 mph. Then I had ACG San Diego rebalanced the wheels again, then now it becomes severe. Since they have balanced twice, I guess it wouldn't be balancing issue? Here's the symptoms of vibration:

1 any speed after 80 mph
2 braking (the car feel like falling apart during hard braking)
3 a metal to metal rubbing sound from rear (I guess this is more like a brake issue?)

What should I do to fix it? Any help would be appreciated.
 

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what size wheels are you running... make sure the offset will be compatible or else it will sit/rub too close to your brake calipers and can damage them and your rims. Re tighten all your lugs and make sure they are snug. Maybe do a quick check on the bolts to your rear suspension components (sway bar endlinks, struts, brake calipers, check your pads and rotors, etc)
 

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Hi guys, I recently bought a set of 20" Forgedstar's as street wheels. The car had light vibration after 80 mph. Then I had ACG San Diego rebalanced the wheels again, then now it becomes severe. Since they have balanced twice, I guess it wouldn't be balancing issue? Here's the symptoms of vibration:

1 any speed after 80 mph
2 braking (the car feel like falling apart during hard braking)
3 a metal to metal rubbing sound from rear (I guess this is more like a brake issue?)

What should I do to fix it? Any help would be appreciated.
Most vibrations on low mileage cars are usually just a simple balancing issue, but in this case you said it's already been rechecked. Second most likely cause is the wheel is out of round. Third most likely cause is your tire is flat spotted or defective.

Vibrations under braking are usually caused by warped rotors or excessive deposits on the rotors.

Give us a little more history on the car, such as mileage, usage, etc, and when pricely did the vibration start happening.
 
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