Shimano GRX RD-RX820 2x12sp. Rear Derailleur

Enhanced chain security and quieter, more stable shifting for gravel riding. The RD-RX820 is compatible with 11-34T and 11-36T 12-speed cassettes, providing a wide gear range so you can spin a comfortable cadence no matter the terrain type. The SHIMANO GRX 12-speed rear derailleur also features an integrated chain stabilizer that delivers quieter shifting and more secure chain management during rough rides. And the chain tensioner has an ON/OFF switch for outings on smooth surfaces

• Silent and secure rear shifting on rough terrain
  
• Adjustable chain stabilizer prevents chain slap and drops
  
• Shimano Shadow RD+ offers less distraction, a quiet drive train, reduced chain slap and a solution for chain drop
  
• ON/OFF stabilizer switch matches terrain for smooth and reliable shifting on mixed surfaces
  
• Direct attachment, w/OT-RS900 (Black) 240mm x1, long nose cap x1
  
• Compatible with HG 12-Speed Chains
  
• Top sprocket: Max. 11T/Min. 11T
  
• Low sprocket: Max. 36T/Min. 34T
  
• Total capacity: 42T
  
• Max Front Difference: 17T
  
• Compatible Chain: HG 12-speed
  
• Recommended Cassette: CS-R8101-12 11/30T or 11/34T; CS-R7101-12 11/34T; CS-HG710-12 11/36T
  
• Cable Adjuster: yes
  
• Cage Length: One-Spec
  
• Pulley Teeth: 11/13t
  
• Weight: 270g.
  
• Color: Black