SRAM X4 Trigger Shifter Set - 8 x 3 SpeedSRAM X4 Trigger Shifter Set 8 x 3 Speed The X4 offers the proven SRAM 2 lever trigger shifting performance in an more affordable price point. Featuring proven ergonomics and award winning 1: 1 Actuation, this trigger shifter sets the standard for entry level performance and value. 1: 1 Actuation: This term pertains to the fact that for every 1mm of cable pull (or release) at the shifter, you get 1mm of cable pull (or release) at the derailleur. In