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 ... 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 only ...