Shimano Ultegra RX road clutch rear derailleur spotted

The unreleased Shimano Ultegra RX clutch rear derailleur on a bike belonging to Trek-Segrafredo's Jo

This article first appeared on BikeRadar . Ahead of the cobble-filled Tour of Flanders , WorldTour squad Trek-Segafredo was testing a new Shimano Ultegra RX clutch rear derailleur. Shimano is not yet talking about this clutch derailleur - which, notably, works with two chainrings - but BikeRadar talked to Trek-Segafredo riders and staff about their experience with the product. Degenkolb shortens cranks, changes bar for cobbles Readers familiar with Shimano's Shadow Plus mountain bike derailleurs will recognize the technology: a switch, or 'clutch', flips the derailleur between a soft-spring setting and a firm-spring setting. The former works like a normal road derailleur; the latter pulls the chain tauter, reducing if not eliminating chain slap and the possibility of dropping a chain on rough terrain. Shimano Ultegra RX Di2 clutch derailleur The Tour of Flanders contains more than a dozen cobbled stretches, many on short but sharp climbs, or hellingen . ...

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