With an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter riding experience and secure, precise shifting on mixed terrain. For smooth surfaces, the derailleur features an ON/OFF switch for the chain tensioner.
The RD-RX817 DI2 version offers the digital precision of electronic shifting and SHIMANO's synchronized shifting, and is compatible with MTB cassettes with a max. low gear of 42T.
The components of the bicycles, as described on this page, are those specified by the manufacturer at the time of launch of a new product.
Please note that these components may be subject to change without notice by the manufacturer for other components of similar characteristics.
If you need to confirm the specifications of any component, we recommend you visit the manufacturer's official website or contact our customer service team.