Some readers will likely note Shimano already has clutch mountain bike derailleurs that can be paired ... The company’s product team emerged from the rides recognizing the importance of disc brakes ...

Shimano 105 Di2 Hydraulic Disc Brake ... Blue Mountain which was 68 miles and 5,500 feet of climbing and SkyMass which was 81 miles and 7,400 feet of climbing). If you’re thinking about converting ...