my clk500 (2004) vibrates at speeds higher than 50 mph. the tires are new (19" 3-piece wheels). the tires are balanced. any suggestion as to what could be causing the vibration. thank you for your time!

 

Most reposts of vibration are from people who do not use facotry wheels. So that is the first suspect. Do you use spacers with your wheels? If so are they thick enough to be hub centric - usually 10mm?

 

You'll probably want to pay for a road-force balance. Often, the rims will be out of balance, then the new rubber is out of balance but on a different radius. Road force balancing will determine where these two OOB points are, and then the mechanic can rotate the rubber on the rim to make them align and balance with one weight. If you ever come back from the "tire shop" to find two weights on a rim, then you need this done. Most tire stores don't do it. You need to find a shop with a Hunter balancer (it used to be the 9000, but they have newer equipment now - go to the Hunter website to research and locate a shop).

 

I had a small vibration that started to get more noticeable with time. I found the new tire I had bought was bad from stock, and that caused my vibration. I took it back to where I bought it and they gave me a new one at no charge. The tire had 6,000 miles on it. The tire tread separated from the core, and the only way that was noticed is when the tire was totally deflated.