I've just noticed that the Dura-ace and Ultegra cassettes on Mrs G's and my roadbike appear to have black spacers with '105' on them, which seems a bit odd to me. I know the Dura-ace cassette was a Dura-ace cassette, as I'd bought the groupset separately and took it to the bike shop who built it onto a frame. The Ultegra groupset was provided by the same bikeshop, and they built that straight onto a frame they provided. I haven't yet had the chance to take either cassette off the wheel to see if it is still the right one, so I might be worryingly un-neccessarily. So if anyone's got a D-A or Ultegra cassette, and can see any writing on the sprocket spacers, let me know what it says! Ta.