Heres my story. I have a new set of Yoko A520's on 4/ 17x8 MilleMiglia rims. The size is 235/40/zr17 on all 4 wheels. The problem is - - I have a noticeable amount of Trammeling/Steering wheel shimmy, and I have been told by the BMW dealer that to run 17" wheels, the correct tire size would be 225/45/zr17. I was ready to go out and purchase 2 new A52O's in that size, however they are not available. The next size is 215/45/zr17, smaller than what stock is. I DO NOT want to have to buy 4 new tires, but I need to do something. Can I put 215's on or should I get a different brand of tire (need suggestions) just for the fronts in the correct size of 225/45/17? Any input helpful!! 97 z3 1.9