Sram gx dh 7 speed rear mechthe sram gx dh 7 speed rear mech brings you world championship winning technologies such as x actuation and x horizon which ensure fast consistent and precise shifting these technologies used to be reserved for srams top end models only but with gx dh you can now enjoy the same drivetrain performance that the pros enjoy at a more affordable price features materialaluminium cage speed7 speed compatibilitygx dh 1x7 max tooth28t pulleysx sync pullx