The X.7 Rear Derailleur offers performance and durability with the distinctive SRAM shifting process. The X.7 is a great value without compromise.1:1 shifter-to-derailleur actuation ratio for precise light-action indexingMust be used with ESP shiftersAluminum upper knuckleReplaceable 11-tooth pulleys with bushingsExact Actuation shiftingServiceable sealed pulleys10 speed models have carbon fiber outer pulley cageCompatible with 7-, 8-, and 9-speed systemsItem SpecificationsColorGrayIntended UseMountainCassette SpacingShimano/SRAM 9Shifter/Derailleur CompatibilitySRAM 1:1Largest Cog36teethChain Wrap Capacity35teethDerailleur ActionTop-Normal (Traditional)Cage LengthMedium