SHIMANO Rear Derailleur RD-RX817, GRX,11-SPEED, 1x11, Di2 pickuponly as this sits on the

as this sits on the hub shell

stamped steel cogs held together with 123 high-strength stainless steel pins

Rails: Chromoly Rails

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

SHIMANO Rear Derailleur RD-RX817, GRX,11-SPEED, 1x11, Di2 pickuponly as this sits on theWith 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