Hi
@DavidYen, 255/70/18 should fit just fine. Assuming that wheel width and offset are the same as the OEM wheels, the only difference would be the overall wheel diameter.
View attachment 304705
The last four stats detailed are what you need to be aware of. The arch gap loss means that the tire will be 25.6mm closer to the fender liners than the OEM setup, but again, as long as the rim's width and offset are the same as the OEM wheel, there is plenty of space to work with.
Thx sm1ke for prompt response. I have gotten an used set of wheel from a CX 9 for winiter tires and the dimension is 18x7.5.