XTR RD-M9100Hyperglide+ offers fast and shockless shifting Silent and stable operation in all gears Low profile design Two cage lengths available: SGS, compatible with 12 speed 10 51T cassettes, and GS, compatible with 11 or 12 speed 10 45T cassettes Decreased rear derailleur and chain tension in low gear New bumper added to rear derailleur pulley cage Bigger 13T pulleys with sealed bearings for increased drivtrain efficiency Weight: 240g (SGS) Attributes Maximum
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