MY 1986 300 SDL HAS 203K ON IT- THE FRONT END HAS A SHIMMY AT 60+ MPH- IT IS WEARING THE OUTSIDE OF BOTH MY FRONT TIRES- I HAVE REPLACED BOTH TIE RODS,CENTER LINK,STEERING SHOCK AND HAVE HAD COUNTLESS ALIGNMNETS & WHEEL BALANCINGS- AT MY LATEST ATTEMPT TO GET IT FIXED- THE TECHS FOUND NOTHING WRONG WITH THE CAR BUT BLAMED IT ON THE TIRES- CONTINENTAL CH90'S- BUT WHY DO I HAVE THE SAME PROBLEM WITH MY SET OF STUDDED SNOW TIRE ON THEI ON SET OF RIMS?