Shimano Deore XT RD-M8100 RD+ 12 Speed Rear Derailleur Long Cage BlackThe Shimano Deore XT RD-M8100 RD+ 12 Speed Rear Derailleur brings fast and precise shifting performance optimized to take on any trail with extra stability on rough trails. The low profile design and new bumper on the rear derailleur pulley cage gives it faster and shockless shifting on your 1x12 speed mountain setup. This model is a direct mount and is available in a Medium cage or Long cage. The Low Sprocket Max on the medium cage is 45t, and the long cage is 51t. The top sprocket minimum and maximum is 10t, and the total capacity on medium is 35t and the long is 41t. Available in Medium and Long Cages.192790443645