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Join Date: Jun 2008
Location: Antelope Valley, SoCal
Posts: 473
Bikes: 1975 Eisentraut Ltd, 1995 Trek 7000 MTB, 2007 Masi Vincere, 1974 Masi GC, 1981 Specialized Allez, 1984 Specialized Sequoia
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Hi Thomas and welcome!
You said it right - try it and see. I've made 28 tooth cogs work with various derailleur and dropout combinations and most will work. You may have to try moving your axle position further aft.
BTW, I still like UG gears for friction shift and use a Dura Ace EX (is that the same as 7200?) UG cassette and a Campy NR RD effectively at 28t.
Good Luck! - Jim