Why not 17s?
Honestly the main reason is cause I already have brand new 225/40/18 tires and don't want to buy another set for 17s with the rims. But in some ways 17x9 would make the rim deeper so that would be cool. Idk I will look into it. Idk what difference in width and offset I could run if I had 17s instead but not sure it is worth it.