The SRAM Force CX1 Medium Cage Rear Derailleur provides the fastest, quietest, 1x11-speed shifting available for cyclocross by adopting all the technologies of their renowned 1x mountain bike drivetrains. A straight parallelogram design and pulley offset keeps the chain gap constant across all 11 gears to increase shifting speed, reduce shifting force, and eliminate ghost shifting. The Roller Bearing Clutch technology eliminates chain slack and provides smoother, quieter, and more secure chain travel. SRAM's Cage Lock technology makes wheel removal and installation easier than any other derailleur on earth. And when paired with the SRAM CX1 Shifter, this rear derailleur forms the backbone of Exact Actuation technology for incredibly fast and precise shifting action. Dedicated 1x rear derailleur optimized for the demands of cyclocross Exact Actuation technology for fast, accurate shifts using SRAM's 1:1 actuation ratio (shifter cable travel: derailleur movement) Alternating narrow/wide 12T pulley teeth enhances chain retention Roller Bearing Clutch achieves drivetrain stability by eliminating derailleur bounce and chain slap without sacrificing precision Cage Lock technology makes for fast wheel changes or chain installation X-Horizon technology limits all movement to horizontal axis which makes ghost shifting impossible while also reducing shift force Compatible with 10/11-speed SRAM drivetrains Medium cage design can handle up to 36T cassette cog Weight: 261 grams