Well that was the plan when I got here for Grad School. I got the 18" for cheap but didnt get around to selling the 17". Finally have to do it because I leaving for home. The second reason is that tire life is still good enough on the 17s. I would have to buy new tires for the 18s.

Or yet a better option sell the 18s drive home on the 17s and buy 20s when I get home.