Shimano GRX RD-RX822 1x12-speed Rear Derailleur
Silent and uninterrupted rear shifting on rough terrain
Adjustable chain stabilizer prevents chain slapping and drops
SHIMANO SHADOW RD+
Smooth and reliable mixed surface shifting
Gravel-tuned clutch tension
Compatible with current road DUAL CONTROL LEVER

RD-RX822-SGS  
51T max cog size
Works with 12-speed 10-51 teeth cassette
Product features
Use: Gravel, Cyclocross
Group: GRX
Model: RD-RX822
Mount: Direct attachment (Conventional)
Technology: Shadow RD+
Gradations: 
SGS-Type 1x12-speed (10-51 cassette)
Compatible chain: 12-speed HG
Max. teeth large sprocket: 51T (SGS)
Min. teeth large sprocket: 51T (SGS)
Max. teeth small sprocket: 10T
Min. teeth small sprocket: 10T
Max. Front Difference: 0T
Total Capacity: 41T (SGS)
Type-SGS long

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Note:
100% authentic, without the original box 

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