I ran 18x9.5+12 all round w 235/40/18 R33 gtst
best offset for stock guards IMHO
http://www.skylinesaustralia.com/forums/topic/412682-300-rwkw-gtst-top-shelf-parts-only-price-drop-for-members/
guards are practically the same
until the bolt your mechanic left in your intake pipe destroys your $3000 HKS turbo and sends metal shards through your freshly built RB26....
that feeling is only amazing for everyone else