SHIMANO Rear Derailleur RD-RX817, GRX,11-SPEED, 1x11, Di2 pickuponly and a relaxed riding position

and a relaxed riding position that keeps you more upright and comfortable in the saddle

allowing higher strength at low weights

Roller wheels for rolling when folded

Rails: Chromoly Rails

SHIMANO Rear Derailleur RD-RX817, GRX,11-SPEED, 1x11, Di2 pickuponly and a relaxed riding positionWith 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. Top sprocket: Max. 11T