Shimano XT BL-M8100 BR-M8120 4 Piston Brake Set F/R 100/170cm w/Resin Fin Pad | eBay
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
Stages Shimano XT M8120 Driveside Power Meter - Power Meter City