I Tested Shimano XT M8100 On 4 Bikes. When To Buy And When Not To Buy This Groupset. - YouTube
Shimano XT BR-M8100 Disc Brake | Jenson USA
Shimano XT M8100 Complete Groupset - Brands Cycle and Fitness
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