Hey mate, i own a 2012 rukus and i am running tanabe df210 springs with 19" xxr wheels, i don't get any rub on the guards what so ever, only abit of underneath scrape on a big pothole or when i got a few in the back, just the standard, its a sexy drop too.. my update thread is here.
http://www.newscionxb.com/123-2nd-gen-scion-xb-talk/9807-flex-update.html
http://www.newscionxb.com/123-2nd-gen-scion-xb-talk/9807-flex-update.html