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

IRDRX820 Shimano Shimano GRX RD-RX820 Rear Derailleur - 12-Speed, Direct Mount, One Spec, Shadow Plus Design, 36t Max Low Rear Derailleur EA Largest Cog 36 Rear Der/Shifter Compatibility Shimano Road Rear Derailleur Mount Type Shimano Rear Direct Mount Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 12 Weight 270 Chain Wrap Capacity (teeth) 42