Shimano GRX RX400 Rear Derailleur - 10 Speed (But many say this also works 11 speed just fine also)

 

For use with a double chainset (will also work single)

10 speed but will also work with 11 speed shifters / cassettes due to same pull ration (Eg RX810, R6800, R7000, R8000)

Shadow plus - includes clutch for chain retention

Wide gear ratio compatible up to 11-36T

Although not advertised will work with 11-42 cassettes in many cases

RRP £64.99

 Shimano GRX, with its gravel specific ergonomics, optimized gearing options, rugged reliability, and quiet and stable drivetrain, sets itself apart from the rest of the component world

 Low profile Shadow Plus design 10-speed rear derailleur for fast and precise shifting performance

Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting