SRAM X01 Trigger 11 Speed Rear Shifter. The SRAM X01 Trigger Shifter provides such flawless chain retention and faster, more accurate shifting of your 1X drivetrain that it's bound to redefine the meaning of trigger happy. SRAM's 1X11 X Actuation delivers precise and dependable 11 speed performance while Zero Loss Travel eliminates excess lever play, so when you shift, your bike responds instantly. An aluminum cover and adjustable forged aluminum pull lever keeps the indexed shifts sharp and crisp. When paired with the X01 rear derailleur, these trigger shifters give unbelievably smooth shifting action.