First ride: Shimano Dura-Ace R9100 hydraulic disc brakes - Canadian Cycling Magazine
Shimano Dura-Ace ST-R9180 Di2 TT Shifter/Hydraulic Brake Lever Set with BR-R9170 Flat-Mount Brake Caliper and J-Kit Fittings, Rear/Right - In The Know Cycling
Shimano Dura-Ace ST-R9270 12-Speed Shift/Disc Brake Set at BikeTiresDirect