Shimano Ultegra RX clutch derailleur cobble-tested

Ben and Josh test chain-quieting tech in Belgium and France

Shimano’s road clutch rear derailleur, the Ultegra RX, first surfaced before the Tour of Flanders in April. Although Shimano wasn’t yet ready to send out samples, I asked Trek-Segafredo to borrow one of the team’s units.


After a quick hotel-room install, my colleague Josh Evans and I took a clutch-equipped Trek Madone and a standard Trek Madone out for a few days of riding.


Watch our short video for impressions on how the technology works on cobbles, rough roads and smooth roads.

Shimano Ultegra RX clutch derailleur first ride