I've had these wheel spacers for about a month now and WOW, what a BIG difference in both looks and handling (They widen the back by 5"). I installed these, along with widening my front end by 6" and, in my opinion, it made my 2004 Honda 400ex go from looking like a boy's quad to a man's quad (it makes that much of a dramatic difference in the looks of any quad). Handling wise, it is much harder now to make my quad roll over when I corner it hard. I went to Glamis, CA this weekend and I jumped off a few sand dunes and so far they have taken the stress. I have cousins that have the same quad with these spacers installed and they use them for amateur motocross and so far they have taken the stress and abuse. GREAT product for someone that doesn't want to spend the extra money for wider axles.