Leonardi General Lee 12sp Cassette 9-50t - Black/RedWide 533% range gearing to tackle hills both up and down Keeps drivetrain simple and still gives the gear range of a 2x system Main body of cassette fabricated from steel, the 3 largest cogs constructed from a solid piece of aluminum; largest cog is replaceable Utilizes XD driver mounting Compatible with Sunrace, SRAM, and Shimano shifting systems TECH SPECS model General Lee freehub type XD speed 12 range 9 50 cogs 9,11,13,15,18,20,23,26,30,35,41,50