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For 1 by X, a medium cage has enough capacity (11-42 needs only 31). Refer here for details of compatibility between different drive line equipment. Using an 11 speed derailleur with a ratio of 1.1 vs 10 speed is 1.2, with a cable pull of 3.4mm, across 9 shifts, gives an error of 3mm. If you have have the derailleur perfect in the center, you are out by 1....



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