How many bodykitted Mini's with 13" wheels did you look at, to get this idea, out of curiousity!?13"s bein small ... as not looking right in proportion.
Where did you get the massive jump from 13" right up to 18"? What happened to 14" wheels up to 17" wheels, why wouldn't you go for any of these?
Check out the following link for a preview of what 15" wheels are like on a standard Mini... You also might fine some useful information:
http://www.minitrailers.com/15.htm
Oh, and check this link:
http://www.theminifo...?showtopic=4960