Im getting a 2002 xr400 in a few weeks. Im gonna make it streetable, and Im looking into supermoto wheels. Complete 17" wheels minus cush are pretty expensive. Motostrano has kits with warp9 wheels with a 320mm front rotor. My question is, since they dont make a kit for the 400, what is the difference between the 400 wheels and 650 wheels? If its only spacers I can make them myself, but I have a feeling its a much more than that.