I had a set of Shimano BR-R517 disk brakes paired with these Shimano Dura Ace ST-7700-C brifters on a monster cross build, but even after many tweaks, the brakes didn't bite quite
Amazon.com : SHIMANO Dura-Ace 7600/7700 9-Speed Track FC-7710 Left Hand Crank Arm 165MM - Y16S98080 : Sports & Outdoors
Shimano Dura-Ace SL-BS77 Double/Triple Bar End Shift Levers | Tree Fort Bikes