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This new GX Lunar derailleur not only answers the Eagle drivetrains need for greater capacity, but its also the next evolution of our proven, 1x-specific X-HORIZON design. The larger, 14-tooth X-SYNC lower pulley allows 10- to 50-tooth cassette, and also adds to Eagles overall smooth-pedaling feel. Our new, Type-3 ROLLER BEARING CLUTCH features a smoother torque curve for a quieter, more consistent operation and feel. CAGE LOCK has been moved back and out of the way, protecting it from trail debris. And a redesigned, robust mounting system further improves the Eagle derailleurs performance and overall durability.