The Sram Force CX1 is the next generation in cyclocross technology, the CX1 is an 11 speed compatible drivetrain.  The engineers at SRAM have combined the best of SRAM’s Road and Mountain Bike technology to produce the simplicity of the Sram Force CX1.  The Sram Force CX1 Rear Derailleur adopts all the technologies of SRAM 1X MTB to provide the fastest, quietest 1X11 shifting available. SRAM’s unique clutch system eliminates chain slack, providing for smoother, quieter, and more secure chain travel.   Specifications: Exact Actuation™ for fast and accurate shifts using SRAM’s 1:1 actuation ratio (shifter cable travel: derailleur movement). 10 and 11 speed compatible.. X-SYNC™ pulley features a 12-tooth design that helps control the chain’s lateral movement.. Additional chain-management technologies include X-HORIZON™, CAGE LOCK™ and ROLLER BEARING CLUTCH™.. 261g.