you can't flip the front ones without changing the valve stems. You can either put a Very short stem in... I think they call them "no raise" valve stems.. I know you can order them at Jegs, Or put a stem in side out and drill a new hole for a new stem... I don't like this idea because you can't switch them back when you want to.... The rears.. you can do the same thing or, what I do is reverse it and put (3) 5/16 flat washers on each stud and the stem will clear... I have ran mine hard like that and have had no problems...the only downside is it steers harder if you do the front, plus it is hard on the bushings and bearings... the benefits...more stability, but more importantly is it looks cool...lol