SRAM, X4, Rear derailleur, 7/8/9 sp, Long cage, Black

Description

* 1:1 actuation (SRAM shifter compatible)* 9/8/7 speed system compatible* Min cog: 11T* Max cog 34T* Front difference 22T max* Total capacity : 45T* SRAM Model ID: RD-X4-A1