SRAM Rear Derailleur Eagle 90 T-Type 12 speed Max 52T (Mechanical)Full Mount Design. T Type compatibility. Silver black colorway. Most robust mechanical derailleur. Replaceable skid plates, outer and inner parallelogram link, cage or cage assembly. The most rebuildable derailleur in the Eagle Transmission Ecosystem. Speed (RD): 12 Cable pull ratio: T Type actuation Cage (RD): Long Max tooth: 52 Color (RD): Black Pulley bearings material: n a Cage material (RD): Aluminum Drivetrain Configuration: 1x Communication