Have a 2004 SC430 . Experienced steering wheel vibration between 50-60mph ( 80-100 mph ). Had new Michelin Pilot tires and new rims installed , road force balance and alignment done , but still vibrated . Finally gave up and took the car to a Lexus dealership . They found three of the new rims were bent and the tires had developed flat spots . After new tires installed under warranty , new Lexus rims , installed by Lexus , road force balance ( Lexus dealer ) , and Lexus dealer alignment, ride is smooth as silk with no vibration. Sure pays to go to the source for quality service !
