absoluteBLACK HOLLOWcage Oversized Derailleur Pulley Cage - For Shimano Ultegra 8150 Full Ceramic Bearings Carbon Cage Black. The absoluteBLACKs HOLLOWcage® for Shimano Ultegra 8150 12-speed derailleurs makes the 8150 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 Ultegra 8150 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)