I was looking into upgrading the springs on my 2015 gt with factory 20s, would dropping it an inch with some Eibach springs cause any problems ? Im just worried about the space between the wheel and fender, all the mustangs in the instructional videos have 19 inch rims. thanks .
The rim size shouldn't have any affect on the total diameter of the tire. This should be the same across the board from 18"-20" rims, the only thing that changes is the sidewall height of the tire. Correct me if I am wrong but I do believe this is the case.