I have a 94 GT convertible that I am putting 17x8 S197 wheels on.
1/2 in spacers on the front, 1 in spacers on the rear.
Because of my driveway I can not lower the car. I want to fill out the wheel wells but not have rubbing issues or have the tires kick sand and gravel on the body.
This is my misses DD so I want an all weather tire vs a performance tire.
What size tires? Should the rears be bigger? Im not going to rotate them. I will give up a few thousand miles before I go to all the trouble.
I just bought the car and the front tires are shot, so I need to replace them in the next few days.
The stock tire size would be 245/45-17; this will give you a total tire/wheel height of 25.68 inches. If you want to fill the wheel well more without lowering the car, you'd have to go with a taller sidewall. So you could run 255/45-17, which will result in a total tire/wheel height of 26.04" which will be a bit taller than what you have (and a bit wider).
Now, assuming you can find a tire in this size, you could also go with a 245/50-17, which will be a total tire/wheel height of 26.65 inches. Or a 255/45-17, which is a total tire/wheel height of 27.04. The problem with these is that 1) you probably won't be able to find tires in those sizes as they are not very common and 2) they will totally screw up your speedometer as they are over 3% difference in size from the stock size.
My advice: don't do any of this. I'm not sure what your driveway looks like, but you can get a set of lowering springs that are quite "mild" - they'll give a drop of maybe 1". The problem with the taller tires is that they will be harder to find, and honestly probably look a little goofy. Unless you are sort of going for the big tire look like on a drag car - but then it will look goofy in the rear. I recommend running the stock sized tire - you'll find them for a good price which will help if you don't plan to rotate. You'll have a little bit of a 4x4 look but I'm not sure it's worse than it would like with taller sidewalls. My recommendation, if you are really concerned with the gap: get stock sized tires and then when time/budget allows, get a set of mild springs to remove some of the gap.
Edit: another reason: running a taller sidewall which increases the total tire/wheel height will ALSO lift your car more off the ground. So, in addition to a taller sidewall, you will be lifting the car off the ground more, adding to the goofiness IMO.