Amazon.com: SHIMANO Deore XT BL-M8100/BR-M8120 Disc Brake and Lever - Front, Hydraulic, Post Mount, 4-Piston, Finned Metal Pads, Black : Sports & Outdoors
Shimano Deore XT 12-Speed Review | The MTB Lab
Shimano's XT and SLX 12 Speed - Mountain Bike Drivetrains