The sram x01 trigger shifter 11 speed rear with discrete clamp is a truly outstanding shifter using the latest in sram technology your shifts will be much quicker precise and reliable the sram x01 trigger shifter uses the zero loss engagement which essentially means that when you push on the lever up or down shift the cable is engaged instantly meaning that you will gain full control to shift whenever appropriate immediately made from aluminium the sram x01 trigger shifter