Shimano, Deore XT BR-M8220, MTB Hydraulic Disc Brake, Front or Rear, Post mount, Disc: Not included, 310g, Black

Shimano, BR-R317, Road Mechanical Disc Brake Caliper, Rear Only, Post mount

Shimano, Saint BL/BR-M820, MTB Hydraulic Disc Brake, Rear, Post mount, Disc: Not included, 312g, Black, Kit

Shimano, GRX Di2 ST-RX815-R / BR-RX810-R, Road Hydraulic Disc Brake, Rear, 11 speed, Flat mount, 140 or 160mm (not included), Black, Set