Interestingly, the thing I find most cool about the SBDU bikes, is that they are one of the only vehicles that are "named" by their serial numbers. I have SB4484 and SB7979. I have many vehicular interests, and the only other ones I have personally heard referred to by S/N are Carrol Shelby's products. Both of mine are in process of reversing their histories back to their initial configuration...
SB4484. Joe Weiderholt (Raleigh SRC Team history)
SB7979 (in process)