Shimano GRX RD-RX812

GRX 11 speed rear derailleur for 1X cranks Adjustable chain stabilizer prevents chain slapping and drops Gravel-tuned clutch tension can be toggled ON/OFF to match the terrain Low sprocket: Max. 42T/Min. 40T Top sprocket: 11T Attributes Max Front Difference Single chainring only Maximum Cog 42T Minimum Cog 11T Primary Color Grey Cage GS RD Capacity 31T RD Spring Type Shadow Plus RD Weight 267g Speed 11 Mount Standard