I've been riding alot more motocross lately and i've been thinkin about gettin 18" rear.....If i get these are they gonna make me spin more and not hook up as good since they are a smaller tire? and is it better to have a smaller rim or a bigger rim?? Also if you get 18" rears what size fronts do u want to run 20" or 19"?? Just wanted to hear some different opinions....18" or would you just leave them at 20x11...Thanks