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Product Image Shimano RD-RX817 GRX Di2, 11-speed rear derailleur, Shadow+, for 1x

Shimano RD-RX817 GRX Di2, 11-speed rear derailleur, Shadow+, for 1x


SHIMANO GRX - DI2 - Rear Derailleur - SHIMANO SHADOW RD+ - 42T max low sprocket - 11-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
    • Top sprocket: Max. 11T/Min. 11T
    • Low sprocket: Max. 42T/Min. 40T
    • Total capacity: 31T


    Given the total capasity is 31T the double chainset (48/31)  cannot be used with a 11-34T cassette Your max cassette range is 11-25T so this is for a single ring and the 11-42T cassette.

    Average weight 318 g
    Top-Normal spring type_SHADOW RD+
    Direct attachment
    E-tube connector (pcs) 0
    E-tube port (pcs) 1
    Firmware update by E-TUBE Project
    Fluoric coated link bushings 4
    Low sprocket_Max. 42T
    Low sprocket_Min. 40T
    Rear speeds 11
    Sealed bearing guide pulley
    Sealed bearing tension pulley
    Top-Normal Spring Type SHADOW RD+
    Top sprocket_Max. 11T
    Top sprocket_Min. 11T
    Total capacity 31T

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