Time for some new ones all round on my 2012 Black Edition and can't seem to find much info on them. Seems that the rears are 232mm which is fine as they are. Are the fronts 288mm as standard? Putting my reg into various websites brings up different options - 312mm being the largest. I assume these slightly bigger discs will fit my car behind 18 inch wheels, but is there really any point in larger discs? The pads and calipers will be the same size, so what difference would they make to the braking produced?