Designed to be compatible with a range of cassette sizes and either 7 or 8-Speed drivetrains, the SRAM X3 rear derailleur is a super-versatile option that’s ideal for beginners to mountain biking, commuters and anything in-between. Technologies: Direct Route: Direct Route Technology doesn’t have a middle-man. Instead, the cable routes directly to the actuation mechanism. Result? Less friction. Less effort. More oomph. Plus it’s impervious to cable housing damage. Nice.