Shimano GRX RD-RX820 Shadow+ 12 Speed Rear Derailleur - Rear Derailleur - 12 Speed - Black - Long Cage - 2x12 - 36T Max Envelope Shipping With the perfect balance of

With the perfect balance of robustness and weight savings

Travel: 150 & 170mm

4% Elastane

This cassette also uses Aluminium spiders for further weight savings and to prevent freehub wear

Shimano GRX RD-RX820 Shadow+ 12 Speed Rear Derailleur - Rear Derailleur - 12 Speed - Black - Long Cage - 2x12 - 36T Max Envelope Shipping With the perfect balance ofThe 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.