The SRAM XX1 was built with a dedicated 1X design philosophy - making it simpler, lighter and more durable than any other. No matter where you ride, no matter what you're up against: SRAM XX1. Unstoppable. With its 'horizontal parallelogram' design and pulley offset, X-Horizon keeps the chain gap constant across all 11 gears, providing fast, precise shifts. By limiting all movement to the horizontal axis, this design is faster, reduced shift force and eliminates ghost shifting. Roller Bearing Clutch technology reduces bounce and chain slap. Cage Lock technology makes wheel removal and installation easier than ever before.
The 12 Tooth X-Sync pulley wheels perfectly mirror the chain's inner and outer link for maximum control. Large upper pulley offset automatically adjusts chain gap. Straight parallelogram design with horizontal movement reduces shift force and improves drivetrain performance, 12T X-SYNC pulley wheels. TYPE 2 technologies: ROLLER BEARING CLUTCH and CAGE LOCK New silent pulley tooth design. The first rear derailleur of its kind, SRAM TYPE 2 lets you push your cage forward and lock it into place with the push of a button. This creates slack, removing all tension from the chain. With Cage Lock, TYPE 2 makes wheel removal and installation-as well as chain installation-easier than any other derailleur on earth.