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The Shimano Alivio RD-M3100-SGS rear derailleur is perfect for 2x9- as well as 3x9-speed MTB riding. Its low profile Shadow RD design avoids not only damage from rocks, but also improves shifting performance. The Top Normal rear derailleur accepts cassettes with a maximum range of 11 to 36 teeth. The guide and tension pulley of the long SGS cage feature 11 teeth each.