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 drops Switch stabilizer ON/OFF to match the terrain Gravel-tuned clutch tension Silent and uninterrupted rear shifting on rough terrain Smooth and reliable mixed surface shifting Compatible with current road DUAL CONTROL LEVER Weight: 318 g Direct attachment E-tube port (pcs): 1 Firmware update by E-TUBE Project Fluoric coated 4 link bushings Maximum smallest sprocket: 42T Minimum smallest sprocket: 40T Rear speeds: 11 Sealed pulley bearing Top-Normal Spring Type SHADOW RD+ Maximum biggest sprocket: 11T Minimum biggest sprocket: 11T Total capacity: 31T