The X4 offers the proven SRAM 2-lever trigger shifting performance in a more affordable price point. Featuring our proven ergonomics and award-winning 1:1 Actuation, this trigger shifter sets the standard for entry level performance and value.1:1 Actuation ratioCompatibility: Sram 1:1 rear derailleurs,Sram or Shimano front derailleursNew two-lever design modeled after Sram’s highest performance trigger shiftersNew easy to read gear indication8-speedWeight: 265g (pair)