Just picked up a 70 Mach I...
How wide of a tire can I run under the rear without any modifications other than the fender lip rolled and the rear rims are 17"x9 (ballpark)? I plan on using a negative offset as well. I hear that I can go as wide as 275mm.
Thanks everyone!
I have a 18x10 with a 295/35/18 KDW tires on rolled lips and those are wider tires than normal for that size. You can do it if you nail the backspacing and your spring bushings are tight, preferably with those offered by Global West and such.
Just like 4 said, if you nail the offset and backspacing, you can get a big tire in there and also have it look pretty good. I have a 67 coupe wih 17x9 rims and 275/50/17 tire. The tire doesnt stick out the finder lip either. So it is possible. What I did, and maybe possible for you is, go to a tire and rim company and ask if you can do a fitment appointment. It only cost me about 20 bucks and I tried on about 4 different rims and like 10 tire sizes.