I mentioned a couple of weeks ago that I had ordered a new 28-11 8-speed cassette for the Dolce. It finally came in this week, but after the shop installed it, the mechanic noticed that the pulley of the rear derailleur was rubbing against the lowest gear. Turns out that rear derailleurs are designed for a maximum size rear sprocket, and if you exceed this max size by too much, the jockey pulley rubs against the low gear sprocket. Who knew?
My options were: put the old 25-12 cassette back on or keep the new cassette and buy a new, better derailleur. So now I have a new cassette and a new Ultegra GS rear derailleur. Woohoo!
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