The GX Eagle Rear Derailleur gets the job done with a thoughtfully designed cage architecture that improves chain management.-Mounting system and re-positioned Cage Lock offer greater durability-Sealed cartridge pulley bearings-Backwards compatible, works with both 10-50t and 10-52t cassettes-Updated cage architecture provides better chain retention and precise shifts-Comes in GX Eagle master colorway as part of Eagle Colorsystem and goes with all colors of Eagle cassettes & chains