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my 6503 crankset came with 52-42-30 rings. I have been sitting on an American Classic 9 speed cassette that has a 28 cog but I have been satisfied with Ultegra 12-27 so far. I think you could change to a 9 speed rear derailer and use a cassette with 32 or 34 cog and keep the rest of your group as is.
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