Xx1 rear trigger shifter 11 speed built to be simpler lighter and more durable than any other the sram xx1 x actuation trigger shifter keeps gear changes sharp and consistent across the entire 10 to 42 tooth cassette no matter where you ride no matter what youre up against sram xx1 unstoppable this xx1 shifter is an integral part of the sram 1x drivetrain system no compromises sram 1x x actuation for precise and dependable 11 speed performance zero loss engagement for fastest shiftin