I couldn't really find any clear information about this, but 18x8.5 +35 wrapped in 235/45 fits pretty damn flush. I think it can be lowered and still clear with some alignment, but I haven't installed my rsr springs yet. I drive through pretty shit roads here in Los Angeles so resisting the urge to lower it. lol. Much better compliance than the 19s, brakes feel better, and maybe loss of 1 or 2 mpg. Forgot to mention, no rubbing on bumps or during full lock.
nice, post your offset too, I couldn't do 17s as 18s already look small on the prius for some strange reason. lol
