A GRX rear derailleur for enhanced chain security and quieter shifting for gravel riding.
Unstoppable and undroppable 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. Product details Silent and secure rear shifting on rough terrain Adjustable chain stabilizer prevents chain slap and drops Shimano Shadow RD+ technology On/Off stabilizer switch matches terrain Maximum front chainring difference: 17T Top sprocket: Max. 11T/Min. 11T Low sprocket: Max. 36T/Min. 34T Total capacity: 42T
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