I have a smoothie steel rim on my roadster that I have been running for years and 20k miles. I started to get a vibration in the front end, figured it was a tire going bad so I bought a new set of tires. Well, I still had the vibration so I checked the run out and the rim was real bad. I don't remember hitting anything so when I looked at it close, I could see where the center had moved. Checked the other wheel and noticed the center was welded in four places. The shaky wheel wasn't welded so I hammered it back and tack welded the center and did a run out and it was true so I finished welding it but I haven't had it out for a test run. How that rim ever got out of the factory without being welded is something.