same thing happen to my car, put 17 rims and tire size is 215/40/17. i was so happy but when i drove it, it shaking as hell. then i went to some shop and they did a wheel balance, it still shake then i went back i said do a high speed balance, then it was all good. sometime it's the rims. where di you bought the rims anyway?? did you bought it with the tires on it?? well just go to a really good service center and tell to do a high speed balance.