wheel

I want to get some black wheels and was wondering I can get for these when I sell them after. Roughly...

FS- 18" VW Huffs (Hufs) -Perfect refinished! Tires, mounted, balanced, TPMS! Chicago RS4 wheels sold! Huffs still available! Freshly refinished PERFECT OEM VW GTI Huffs (Hufs) with Goodyear Eagle F1 All Season tires - 225/40/18 (all 4 tires great w/ 60-80% tread) - includes TPMS - $899 Local...

I got three flat tires in past three months The horriable road condition in DC area is eating my tires! Is it possible for me to downgrade my 18" wheels to 17"? Thanks in advance for your help!!!