Shimano GRX RD-RX820 Shadow+ 12 Speed Rear Derailleur - Rear Derailleur - 12 Speed - Black - Long Cage - 2x12 - 36T Max YGroup_7033453117485 Both 3/32" & 3/16"

Both 3/32" & 3/16"

- Also available in PEAKPOLAR lens

and superior flex-point comfort

Mallet DH pedals feature 8 adjustable pins per side

almost 90° angle to reduce fatigue of the arms and provide a wrinkle-free fit

Shimano GRX RD-RX820 Shadow+ 12 Speed Rear Derailleur - Rear Derailleur - 12 Speed - Black - Long Cage - 2x12 - 36T Max YGroup_7033453117485 Both 3/32" & 3/16"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.