I have a 1982 300D. My problem is that when I drive through sharp dips at speeds over 40 MPH, the car bottoms out and the tire rubs the fender well. The tires on the car are P215/70R15's. The recommended size, posted on the door post, is 195/70SR14. If I went back to the recommended size, would this eliminate the tire rubbing? The rest of the time the car rides real smooth.