225/40/18, 225/45/17, 225/50/16 will keep your stock tire height If you only go with a 7 inch wide rim, only put a 215 wide tire on it. I also think if you only drop the car 1 inch it will look funny with 18's. The ride is also pretty rough. 17's are really popular for our cars. 16's seem to be the choice for AutoX.