Completely redesigned to incorporate Sram`s proven X-Horizon design and new Type-3 Roller Bearing Clutch for the perfect shift every time Completely redesigned to incorporate Sram`s proven X-Horizon design and new Type-3 Roller Bearing Clutch for the perfect shift every time Re-engineered mounting system and repositioned Cage Lock button move the important bits out of harms way Eagle pulley technology provides greater efficiency, crisper shifting, and quieter operation Aluminum cage with lightweight hardware Compatible with 12 Speed Eagle drivetrains only