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The medium cage (GS) on the 12speed XTR model is supposed to be used only with a 10-45 cassette on a 1x setup, as the max sprocket size is 45t and total capacity is 35t.
If you have a 10-51 cassette and/or a 2x setup you will need a model with a long cage (SGS).
Thanks, I have a 10-51 and my current M8100 is SGS. Thanks Aglo.


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