The sram x9 trigger shifter is a fantastic addition to any mountain bike that is looking for lightweight components that are slick to use and durable enough to handle the off road trails the x9 shifter has a new smaller design for the new year for more compact shifting and uses the same technology as the xx and x0 parts for dependable performance the sram gear shifter uses impulse technology and is matchmaker compatible to save on weight for better performance and less space taken up on t