SRAM X4 (R) DER LONG CAGE 8SP     Compatible with 7-, 8-, and 9-speed systems     1:1 shifter-to-derailleur actuation ratio for precise light-action indexing     Cage Length: Long     Drivetrain Spacing: Shimano/SRAM 9, Shimano/SRAM 8, Shimano/SRAM 7     Chain Wrap Capacity (teeth): 45 teeth     Shifter/Rear Derailleur : SRAM 1:1     Largest Cog: 34     Color: Black     Rear Derailleur Mount Type: 10x1 Standard     Weight: 280 g Color: Black Speeds: 7, 8, 9 Speed Cage Length: Long Cage