FWIW, the wheel can be ordered online from Tischer BMW (in MD) here:
http://www.trademotion.com/partlocat...72&catalogid=0
I used the 125/70 18 tire, as well--the Maaxis looks like a better solution, but if you have trouble tracking that down, Tire Rack sells the Continental 125/70 18 tire. It's hard to find online, but if you call them they have no trouble looking it up.