With the new Ultegra RX derailleur, Shimano expands compatibility to mechanical road shifting and suggests there is a benefit in having a clutch rear derailleur with double front chain rings when ...

The front derailleur couldn’t move the chain far ... I’ve ridden the new Dura-Ace 12-speed Di2 also, and Shimano’s Ultegra group performs every bit as well, but for a lot less money and ...

And if Ultegra is this good, it makes me wonder how good 105 ... Shimano 105 Di2 Hydraulic Disc Brake Dual Control Levers (2×12-speed) – Left (front derailleur/brake) and Right (rear derailleur/brake) ...