SRAM REAR FORCE 1X TYPE3.0 LONG CAGE 11s GY 42T MAX COGThe SRAM Force 1 rear derailleur adopts all the technologies of SRAM 1x MTB to provide the fastest, quietest 1x11 shifting available SRAMs unique clutch system eliminates chain slack, providing for smoother, quieter, and more secure chain travel Exact Actuation for fast and accurate shifts using SRAMs 1: 1 actuation ratio X sync pulley features a 12 tooth design that helps control the chain`s lateral movement ROLLER BEARING CLUTCH`s one way roller