I want to do two things to the bike that will make it a bit better for off-roading and wonder if any one else has done anything on these lines. 1. I am contemplating getting my F800 GS's rear wheel laced with an 18 inch rim to improve tyre choice. This will affect the ABS ( which I use on the road). The owners handbook implies that a change in wheel size might be catered for by re-programming the ABS computer but makes no promises - anyone else done this? 2. Reversing default condition of ABS - so that it is off by default and has to be switched on. As I found out on a steep slippery descent after stalling the motor with over-ambitious braking and restarting it as you slide/roll down, leaves you with no brakes to speak of.