The Shimano GRX Shadow Plus RDRX820 12-speed rear derailleur was developed for gravel use. The 2-speed gears and wide, stepped cassette support you on every climb. The integrated chain stabilizer for quieter gear shifting and safer chain management in rough terrain. The chain tensioner has an ON/OFF switch that makes wheel removal easier.

- quiet and safe shifting on changing surfaces
- mechanical rear derailleur for 2x12-speed setup on gravel bikes
- flat design prevents snagging
- Compatibility: Shimano Road 12-speed
- max. largest pinion: 36 teeth
- min. largest pinion: 34 teeth
- max. smallest pinion: 11 teeth
- min. smallest pinion: 11 teeth
- Mounting: Direct mounting
- Version: 12-speed
- Weight according to manufacturer: 270g

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