What Size Tires/wheels To Upgrade To?

[MustangGT2002]

I'm getting ready to get new tires for my 02 GT, and figured what a good time to get some different wheels which I've been wanting. I currently have the stock wheels at 17 inch and the tires at 245/45. I don't plan to do any modifications so I need something that would fit on stock. I feel 20 inch rims might not look the best on an 02, and I'm not sure if that would require any modifications to fit. I think the best would be an 18, maybe a 19. What's everyone's opinion on an 18 or 19 and then what size tires would you recommend that would fit no issues? I saw a lot of 255 or 275 going along with the wheels but saw one person post the 275s rubbed in front a little. Any suggestions, personal experiences and/or pictures would be greatly appreciated.

 

[HawkX66]

First pic are 20s. Terrible... How my car initially came.
2nd pic. How it's set up now. 315/35R17s on the rear. Perfect... Doesn't even come close to rubbing. Plenty of room. You really need to pay attention to your backspacing if you plan on going to a wider or taller tire. There's a pinned thread that has tons of pics of 99-04 Mustangs with different wheels you can go through. Some have the specs posted.

 

[Sketchy_GT]

First pic are 20s. Terrible... How my car initially came.
2nd pic. How it's set up now. 315/35R17s on the rear. Perfect... Doesn't even come close to rubbing. Plenty of room. You really need to pay attention to your backspacing if you plan on going to a wider or taller tire. There's a pinned thread that has tons of pics of 99-04 Mustangs with different wheels you can go through. Some have the specs posted.

what size are your rear wheels

 

[HawkX66]

what size are your rear wheels

Rear:
Wheel 17x10.5
Tire 315/35zr17

Front:
Wheel 17x9
Tire 275/40zr17

Nitto NT555