1x drivetrain dedication by design, this is SRAM's XX1 line. Simple. Light. Durable. Less is more.
The "horizontal parallelogram" design and pulley offset comprise the X-Horizon technology which keeps the chain gap consistent across all of the 11 gears--and provides fast, precise shifting. All movement is limited to the horizontal axis; this design makes shifting faster, shift force is reduced, and ghost shifting is eliminated. Roller Bearing Clutch technology reduces bounce, reducing chain slap. Cage Lock technology simplifies wheel removal and makes installation easier than ever. Paired with the XX1 shifters, X-Horizon makes this rear derailleur the backbone of X-Actuation technology--providing the overall unbelievably smooth shifting.
Largest cog: 42
X-Actuation technology was developed specifically for SRAM XX1, it helps keep shifting sharp and consistent across 10-42t.
The X-Sync technology is in the "wide tooth, narrow tooth" pattern that repeats around the pulley wheel, mirroring the chain''s inner and outer links. This is what maximizes chain control.
With Cage Lock technology, wheel removal, installation, and chain installation become fast and simple. Push the cage forward to create slack and lock it into place.
Roller Bearing Clutch technology simply eliminates derailleur bounce and chain slap, with no sacrifice to precision.
The X-Horizon technology is in the rear derailleur''s "straight parallelogram" design--limiting all movement to the horizontal axis, making ghost shifting impossible, and reducing shift force. For fast and precise shifting, the upper pulley offset design keeps a constant chain gap across the whole cassette.