Have the tires' balance checked with a road force tire balancer. That will show up a bent wheel or tire belt problem. The mechanic will also "read" the tire wear for signs of misalignment. Ball joints, tie rod ends, struts, and lower control arm bushings should also be checked. A loose part can cause a tire to walk off to one side and spring back once the sidewalls can't flex anymore.
Monday, January 23rd, 2012 AT 5:47 PM