The SRAM GX X-HORIZON™ rear derailleur is engineered for smooth, reliable shifting action-from the larger upper pulley offset to the 12-tooth X-SYNC™ pulley wheels. By eliminating unwanted chain movement, X-HORIZON™ shifts faster, puts an end to ghost shifting and reduces shift force and chain slap. And with CAGE LOCK™ technology, wheel removal and installation are easier than ever

• X-HORIZON™ design reduces shift force, ghost shifting and cage slap
• 12-tooth X-SYNC™ pulley wheels
• Large upper pulley offset automatically adjusts chain gap
• Sealed cartridge bearings
• Aluminum cage