With an integrated chain stabilizer mechanism, the Shimano GRX RD-RX817 11-Speed Di2 Rear 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 shif
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