SRAM X4 8-Speed Rear Derailleur Cage Lengths: SGS-long, Capacity: 45T, Derailleur Action: Top-Normal (Traditional) Derailleur Color: black, Drivetrain Spacing: Shimano/SRAM 9, Largest Cog: 34teeth, Min/Max: 11/34T Shifter/Rear Derailleur : SRAM 1:1, Speeds: 7/8sp, Speeds: 8sp, Speeds: 9sp, Weight: 310g