Just a note from recent personal experience, when you take the wheels to the tire shop, take them somewhere that will let you watch them work and check the wheels yourself carefully while on the balancer. I just had to replace one of the factory mags on my wife's car that had just a slight bend to it. Hard to notice even on the balancer if you weren't looking for one (tires had been spin balanced dozens of times in the past) but it would cause a vibration in the car anytime it went over 65 mph. New wheel - no more vibration.