Nope, hold on, I was right the first time. KW state 320-350mm from wheel centre to the lip of the arch. The total ride height from the floor to the arch is the height from the floor to the wheel centre PLUS the 320-350mm. Hence the wheel size matters. However, since the diameter of a 225/40 18 is the same as a 205/55 16, then in our particular case it doesn't matter. Why do i think about things too much, I'm off for a Stella...

Good man, I done the same. Hence my reply this morning.