I just bought a set of wheels and it came with an 8 speed shimano cassette in a 13-23 configuration. It is either an Ultegra or Dura Ace version, but I am not sure which. Looks almost brand new. Very little wear showing at all. This guy had not ridden the wheels in years. I can send a picture of the cassette to interested parties. I'm asking $25 shipped or best offer. You can email me at onrhodes at yahoo dot com. I will only ship within the continental US.
