I second that - I tried a third time to go to discount tire after arguing with the store manager about the poor balancing. He first tells me that I have the wrong tires on my car b/c it differs from factory. My tires are 245s instead of 235s. Then, he tells me that I have the wrong speed rating and tread wear. He says all this without providing me any technical information as to why this is causin the vibration, just that it is wrong from factory spec. I said "thanks hotshot" but tell me why it is vibrating - which he couldnt. So he offered to put it on this balancer which puts 120 lbs /sq. inch on the tire to simulate a load while balancing. No idea what this machine was but they put the tires back on - I drove for like 2 miles which appeared to be much better and then wammo - the vibration comes back at 60-72mph. Im done with Discount - I dont buy that the treadwear and speed rating of any tire prevents it from being balanced. I guess Im off to the dealer who quoted me $300 depending on how many times they have to take the wheels off the car. Fer cryin out loud..........
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I haven't had this problem with my GS430 but I did have the exact same problems with Discount Tire when I had my Volvo S70 T5. I had aftermarket wheel and was having fits trying to get rid of 70 MPH + vibration, hub rings helped but the thing that made the difference is making sure the technician tightened my lug nuts by hand. After 4 visits to Discount and them telling me it was my ____ fill in the blank. I got fed up, jacked up my car, removed and then replaced my wheels and presto. In subsequent visits I demanded that they not use the impact wrench to tighten down my wheels and the problem did not resurface.