Shimano GRX RD-RX812 rear derailleur 1/11-speed

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  • SHIMANO GRX Rear Derailleur 11-speed (42T max low sprocket)


    SHIMANO GRX - 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-RX812 rear derailleur is compatible with mtb cassettes with a 42T low sprocket max.

    • Silent and uninterrupted rear shifting on rough terrain
    • Adjustable chain stabilizer prevents chain slapping and drops
    • Smooth and reliable mixed surface shifting
    • Switch stabilizer ON/OFF to match the terrain
    • Gravel-tuned clutch tension
    • Compatible with current road DUAL CONTROL LEVER
    • Top sprocket: Max. 11T/Min. 11T
    • Low sprocket: Max. 42T/Min. 40T
    • Total capacity: 31T

    • Series: SHIMANO GRX 11-speed
    • Weight: 267 g
    • B-Axle Hollow axle: Yes
    • Cable adjuster: Yes
    • Compatible chain HG-EV: 11-speed/HG-X11
    • Direct attachment (Conventional): Yes
    • Fluoric coated link bushings: 4
    • Low sprocket Max.: 42T
    • Low sprocket Min.: 40T
    • Pulley G pulley bearing: Yes
    • Pulley Sunken type pulley bolt: Yes
    • Pulley Teeth: 11T
    • Pulley T pulley bearing: Yes
    • Rear speeds: 11
    • Top-Normal Spring Type: SHIMANO SHADOW RD+
    • Top sprocket Max.: 11T
    • Top sprocket Min.: 11T
    • Total capacity: 31T


    • Less distraction quiet drive train
    • Rear derailleur stabilizer reduces chain slap
    • Simple solution for chain drop
    • Lighter and more efficient than roller type chain device
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  • This article cannot be shipped to countries outside of the European Union and all other countires of the European Free Trade Association (EFTA).
    Factory number:IRDRX812
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