Shimano GRX RD-RX815 Rear Derailleur - 11-Speed Long Cage BLK With Clutch Di2 For 1x 2x CheckoutSpec= 12x142mm - Black Rotor Included No Brake Caliper

Rotor Included No Brake Caliper Type Post Mount Color Black Color Silver piston covers Hydraulic Fluid Type Mineral Oil Pad Compound Semi-Metallic Brake Position Front or Rear Defined Color Black

Color Black Brake Track None Wheel Size 29" Defined Color Black ISO Diameter 622 / Road / 29" Hub Drilling 32 Rim Material Alloy Tire Type Tubeless Ready Valve Presta

As described by Dennis Ranalter

Color Black/Silver Defined Color Black Defined Color Silver Drivetrain Speeds 12 Material Aluminum Offset 3 Ring Position/Type Chain Retaining Single Ring Round or Oval Round Tooth Count 34

Compatible with TQ HPR 50 motor system

Shimano GRX RD-RX815 Rear Derailleur - 11-Speed Long Cage BLK With Clutch Di2 For 1x 2x CheckoutSpec= 12x142mm - Black Rotor Included No Brake CaliperShimano GRX RD RX815 Rear Derailleur 11 Speed Long Cage Black With Clutch Di2 For 1x and 2x. GRX RD RX815 Di2 Rear DerailleurOperates with Shimano Di2 for digital electronic shifting Gravel tuned clutch tension provides smooth and reliable mixed surface shifting TECH SPECS Largest Cog 34 Color Black Rear Der Shifter Compatibility Shimano Road Di2 Rear Derailleur Mount Type Shimano Rear Direct Mount Rear Derailleur Mount Type 10x1 Standard Drivetrain