If you go with the 19's, you will definatly need at least a 35 series tire, maybe a 30. Remember, the wider the tire gets, the taller the sidewall gets even when it remains the same number. For example, a 215/35/18 (what I have, works great, no rub

) will have a shorter sidewall than say a 235/35/19 (probably what you need, maybe a 245). The larger the first number (the width of the tire), the smaller you will be able to find a sidewall size. You will never find a 215/30 tire, but you might find a 235-245/30. I think if you found a 235 - 245/30/19 you would be okay. Preferably the 235/30/19 if you can find a set. The 19" setup will probably cost about a grand more than the 18's though, especially with a 30 series tire, so maybe you should just go with a 215-225/35/18 that you know fits. Good luck (I hope I didn't confuse you, if you need elaboration, just ask).8D