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I'm currently running a 105 5600 groupset with 48/39 front and 12-25 rear. The chain and cassette needs to be replaced soon, but 12-25 and 12-27 cassettes are hard to come by and quite expensive.
Will my RD-5600 SS (short cage), which is officially capable of clearing only a 27 tooth sprocket, also work with a 12-28 cassette? Total capacity is not a problem, front shifting is only a 9 tooth difference.
