I don't get it. I recently purchased a 1992 RB-1 in perfect condition for less than a third of the asking price of the X0-1. The RB-1 came with 600/Ultegra gruppo vs 105 gruppo on the X0-1. It is a lot extra to pay for moustache bars and lower grade components. In 1993 Bridgestone made 1000 yellow and 1000 red RB-1s so they are pretty rare also.