I have seen an XR650 with CBR wheels and custom spacers machined to fit. I have a 98 XR400 that I would like to supermoto out if it's possible and relativity inexpensive. I live about 10 min. down country back roads from my motorcycle shop where I work everyday and am thinking it would be nice to have a SM.? If anybody has seen or done this please let me know. I have no idea of the axle size or any of the specs off the street bike wheels, just a thought at this point but if it's possible I have a buddy with a machine shop that can help me and we'll make a thread about it! Thanks in advance.