I am restoring an old bike that takes a freewheel. Shimano has some nice 7sp freewheels, but large cog is 28 tooth on all of them.
For various reasons that I don't need to get into, I want to use current 105 or Ultegra rear derailleur, but they are both listed as max cog of 27t.
Can I fudge it by 1 tooth with the road rear derailleurs, or do I have to go to a MTB rear derailleur?
I'm looking for an answer to this very limited, specific question, and would very much appreciate hearing from you if you know the answer. I've considered and researched all other issues regarding compatibility of these parts so don't need general comments regarding my choices. Thanks.