Drove wife's car and noticed shimmy in the steering wheel. I told her to get the tires balanced. She brought car to walmart and technician stated that front rim was slightly bent, so they put wheel on rear. Do I get a second opinion being she brought it to Walmart? Rim is not noticably bent from visual inspection. Figured it doesn't have to be a major flaw to notice wheel shimmy. Hate to spend the money to find out there is nothing wrong with said rim. Thoughts?