Leveraging the legendary history of sram shifting the gx 2x10 rear derailleur provides incredible shifting speed and precision. Exact actuation™ technology eliminates slop and shifting variation. Roller bearing clutch™ technology delivers maximum drivetrain stability—even through the most punishing terrain. And with cage lock™ technology wheel removal and installation are easier than ever. - speed (rd): 10s - cable pull ratio: exact actuation - cage (rd): long medium short - max tooth: 36 - color (rd): black - pulley bearings material: steel - cage material (rd): aluminum