Max Tire Sizes
 

I have a 87 GT, I was looking to upgrade from the stock 15"/225 4 lug wheel to a 4 lug 17"/245 or 255 at least, will either fit? Also if I wanted to go to a larger size how wide without modifing the body on a 17" wheel can i go?, or if no one is sure just some tire sizes that you all use would also be helpful.
Thanks in advance for the help!

Re: Max Tire Sizes
 

I run MT street/strip 275/50/15. Had to beat in the fender walls a little, but nothin serious.

Re: Max Tire Sizes
 

Yes!!! I finally get to answer this one- just went through it.

Your fenders on that 87 aren't made for anything very large. They changed in 91 to make more room for steering. If you can buy a couple of new fenders ($70 a piece front ground effects are smaller also I got mine off ebay) it'll make it a lot easier. I even had to take the inner fender garbage out and now it doesn't rub at all.

245 up front
255 in back (or take out quad shocks)
17 x 9 is what I'm running.

A 17 x 8 will fit perfectly with a 91-93 car, being that's what the Cobra had.

Also, you're gonna have to do some work if you want to lower the car on a 17 x 9 set up... I had to take my car back up to the stock rid height to fit them- I've just been through a nightmare with these wheels! ;)