Shimano GRX RD-RX820 Rear Derailleur - 12-Speed, Direct Mount, Shadow Plus Design, 36t Max Low

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The Shimano RD-RX820 rear derailleur 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. This rear derailleur also features an integrated chain stabilizer that delivers quieter shifting and more secure chain management during rough rides. 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
  • Compatible with HG 12-Speed Chains
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