Rear derailleur Shimano GRX Di2 RD-RX817 SH+ 1x11-speed

With an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner. The RD-RX817 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is compatible with mtb cassettes with a 42T low sprocket max.Adjustable chain stabilizer prevents chain slapping and dropsSwitch stabilizer ON/OFF to match the terrainGravel-tuned clutch tensionSilent and uninterrupted rear shifting on rough terrainSmooth and reliable mixed surface shiftingCompatible with current road DUAL CONTROL LEVERWeight: 318 gDirect attachment E-tube port (pcs): 1Firmware update by E-TUBE Project Fluoric coated 4 link bushingsMaximum smallest sprocket: 42TMinimum smallest sprocket: 40TRear speeds: 11Sealed pulley bearingTop-Normal Spring Type SHADOW RD+Maximum biggest sprocket: 11TMinimum biggest sprocket: 11TTotal capacity: 31T