Well, there goes that idea then. I dont think I want to use spacers and longer bolts in there
BMW engineers these bikes with pretty tight tolerances, especially around the tires.
Honestly, there's little practical benefit to changing tire sizes, and if you go too far out you throw off the wheel speed sensors which messes with your ABS, cruise, traction control, and a whole host of other systems that use the wheel speed for internal calculations.
For most riders, it's just not worth it at all . . .