absoluteBLACK HOLLOWcage Oversized Derailleur Pulley Cage – For Shimano Dura-Ace 9250 Full Ceramic Bearings Carbon Cage Black. The absoluteBLACKs HOLLOWcage for Shimano Dura-Ace 9250 12-speed derailleurs makes the 9250 drivetrain whisper quiet. It features a carbon-polymer mono-plate construction with bespoke oversized full ceramic bearings and one of the most advanced silencing pulleys ever made.

• Designed for use with Shimano Dura-Ace 9250 drivetrains
• Fits up to a 34t cassette
• The Silent Xring Pulley dampens the chain impact on the guide pulley teeth eliminating the engagement noise
• Incredibly silent (over 5-7dB noise reduction vs stock)
• HOLLOWcage uses full ceramic bearings (Silicon Nitride ceramic balls and Zirconia Oxide ceramic races) that make the guide pulleys incredibly stiff for greater shifting precision
• One of the lightest oversized cages on the market (71g)

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