I have a front tire problem on my 190E 2.3 which (twice) has worn a new tire to a run-out problem in less than a year each time. There is a noticeable low spot in the tire on the inner most edge. I guess I would describe it as "cupping" but it is in only one location around the circumference (maybe 30 degrees). Most noticeable when braking - can feel feddback through brake pedal. Struts were replaced about 5 years ago. Only happens on right front tire.