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Road force balancers have a drum that is forced against the tire.
I forget what the pressure is but it simulates the forces of the road on the tire.
So the tire is balanced with a simulated road force on them as if they were on the car and being driven. Cost me $25.00 per tire/wheel but it was worth it.
eliminated all my minor steering wheel vibration through out the speed range.
I have had it up to 143 mph.
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