Originally Posted by themattreid
There's always this tubeless system. I used these in desert races. They're a total bitch to get mounted but they work on any existing tube-type rims
. Not even terribly expensive: http://www.nuetech.com/
Nope, you need very narrow rims: 1.6"/2.15" vs. 2.5"/4.25" that the BMW uses (plus the rear is only available in 18" while the BMW has a 17").
This is fine for a mostly off road bike but would of course compromise the street handling.