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Shimano XTR 12v SGS RD-M9120 shifting Enhanced shifting performance Optimized for a new transmission system Silent transmission Reduced tension on the shift in low gears to avoid high chain tension Added buffer on the shift pulley cage Larger pulley from 13D Design low profile Shimano SHADOW RD + Sprocket compatibility 10-45T (2x12 speed) 10-45T (1x12 speed) The XTR M9100 series derailleurs offer a new level of quietness by reducing tension when the lowest gear is selected and thanks to a additional pad on the pulley cage. Wider 13T pulleys increase efficiency and optimize chain management while compatibility with the new 12-speed Shimano cassettes significantly broadens the range.
