Shimano GRX RD-RX810 11-Speed Shadow+ Rear Derailleur - For Double

With an integrated chain stabilizer mechanism, the Shimano GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain.Adjustable chain stabilizer prevents chain slapping and dropsSwitch stabilizer ON/OFF to match the terrainSilent and uninterrupted rear shifting on rough terrainLow sprocket: Max. 34T/Min. 30T / Total capacity: 40TSmooth and reliable mixed surface shiftingCompatible with current road DUAL CONTROL LEVERMaximum front difference: 17T / Top sprocket: Max. 11T/Min. 11TFor rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner allowing you to adapt to the type of surface ahead.  The adjustable chain stabiliser prevents chain slapping and drops and gives you silent and uninterrupted shifting on rough terrain.