XT RD-M8100Hyperglide+ offers fast and shockless shifting Silent and stable operation in all gears Low profile design Extra wide range 12 speed drivetrain 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 Attributes Minimum Cog 10T Primary Color Black RD Spring Type Shadow Plus Speed 12 Mount Standard
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