"I have 40 litre side cases and a 55 litre top box."
I am assuming that this is the size of the three cases that come standard on the 1100RT. Is that correct? Does anyone know of, or have added, a rack to the top of the rear case. Does BMW sell one?
I also thought that you could buy larger lids for the standard side cases to increase their volume. Is that right, or do you have to re-buy both complete, larger, cases?