The SRAM X.4 lineup sets the standard for recreational level shifting. The X.4 has an intelligent blend of performance and value for MTB or pavement. Compatible with 7, 8, and 9speed systems 11 shiftertoderailleur actuation ratio for precise lightaction indexing Must be used with ESP shifters Cage Length Long Drivetrain Spacing ShimanoSRAM 9 Intended Use Mountain ShifterRear Derailleur SRAM 11 Largest Cog 34 Derailleur Action TopNormal Tradi