[QUOTE=naskie18;1889475]But yes, you can go down to the Z85 tire size with no issues if you want.
2 side effects:
(a) Your speedo will be off. You can have this corrected with a tune. Maybe the dealer can do it, since you're going to another stock tire size, but I'm not sure.
(b) It'll look silly.
The height difference will be 22.5MM Total about 7/8"....the truck will sit 11.25mm lower about 7/16"...do you think it would make a big difference visually?